Man vaping next to smok alarm.

Can Vaping Set off Smoke Detectors? The Definitive Answer

Updated: April 2021

When South West Airlines Flight 3654 took off from Ft. Lauderdale, Florida, no one expected any problems.

But one passenger was suffering from nicotine withdrawal.

So part way through the flight he sneaked off to the toilets to stealth vape.

But shortly after he, along with the rest of the passengers, had a massive shock when the plane’s fire alarms went off. 

The pilot was forced to make an emergency landing, with all departure lounges cleared. 

There’s no record of what happened to the passenger, but it is likely he received a hefty fine.

Can Vaping Set Off Smoke Alarms?

Some people will tell you that vapour can’t set off smoke alarms. 

We wanted to find out if vapes can set off fire alarms, so we decided to blow vapour directly into a fire alarm. Here’s what happened:

Now, that’s a bit extreme. In the example above, Tom blew directly into a smoke alarm. Both Tom and I vape in the office all the time, and I’ve never set off an alarm until I blew straight into one, even when using the sub-ohm battery and having a cloud chasing competition with our mixologist. (It’s a hard life working for an e-cigarette company 😉 )

According to Alan Morgan from St Davids Fire, even a bit of cigarette smoke shouldn’t set off modern fire alarms, which have been designed to avoid false alarms.

Nevertheless, if you do use your e-cig indoors, or even worse on an aeroplane (please don’t – the consequences can be serious, as Rory Sutherlend found out when he spent a night in jail in Qatar), your e-cigarette could set off an alarm. That’s especially the case if you blow large clouds!

(If you’re a bit absent minded like me, it might be worth keeping your e-cig out of easy reach when on a plane!)

Which types of fire alarm are vulnerable to vapour?

There are different kinds of fire alarms. Vapour is more likely to set off some of these alarms than others.

Ionisation alarms: Sensitive to small particles of smoke. They utilise two electrically charged radioactive plates. When smoke particles enter the fire alarm they disrupt the electricity between the plates, setting off the alarm. This was the type used in our experiment!

Optical alarms: Optical alarms work by beaming infrared light. When smoke particles enter the smoke alarm, the particles cause the infrared light to be scattered onto a light detector which triggers the alarm.

Heat alarms: Used in kitchens, these are unlikely to detect vapour as they are responsive to heat rather than to smoke.

When we spoke to South Wales Fire and Rescue Service, they told us that optical alarms are the type most likely to be set off by electronic cigarette vapour. However, our experiment showed that vapour can set off ionisation alarms too. 

How likely is your electronic cigarette to set off a fire alarm?

Fortunately, reports of electronic cigarettes setting off fire alarms are rare. Smoke alarms are designed to detect smoke, and electronic cigarettes produce vapour. Fortunately, vapour dissipates a lot faster than smoke.

However, the use of PG and flavourings in e-liquids is thought to create larger particles than the average steam from a kettle. According to Ohio University, fog machines, which contain propylene glycol too, can also set off fire alarms.

So, setting off the average fire alarm is unlikely – but still possible.

Can you vape in a hotel room?

Hotels vary in vape policy – some expressly forbid vaping, while others do not have a vape policy. 

Even if the hotel does not have a policy on vaping, if you set off the smoke alarm they might assume you have been smoking and fine you. 

Hotels often have more sensitive fire alarms than your standard office or house alarm. And when Tom was vaping in a Premier Inn, he noticed that the smoke alarm had started to flash red.

Meanwhile, one poor Reddit commenter set off his hotel alarm at 7am in the morning, woke up the whole hotel and was asked to pay a $200 fine.

Will your e-cig set off a smoke detector in a plane?

Fire alarms in planes are extremely sensitive. Most, if not all airlines, do not allow you to use standard e-cigs in planes (although some airlines do sell vapourless versions).

As we saw earlier, some people have spent a night in jail for using an e-cig on Qatar Airways. That was an extreme example, but you could easily have your e-cig confiscated, have to pay a hefty fine or even be added to a no-fly list.

 In the UK you are not allowed to vape on most trains (or train station platforms) or buses either. 

How to vape without setting off a fire alarm

Obviously, you shouldn’t vape when there is a policy against it.

Whilst policies are sometimes unfair, you personally risk a fine. It can also give a bad name to vapers!

However, there are places where you are allowed to vape which do have a fire alarm.

Our office and warehouse is one example. And yes, someone did set the fire alarm off once, causing the whole building to be evacuated 🙁

This is a great example of a time when it’s fine to vape, but you still need to think about being discreet.

Here are some sensible ideas to minimise setting off the fire alarm. Whatever you do, though, don’t disable the fire alarm. There are 37,000 house fires a year in the UK alone, and it’s just not worth putting your life or others at risk.

1. Blow away from the smoke alarm

First, note where the smoke alarm is, and ensure you blow vapour away from it.

If you work in an office, try to locate your desk away from the alarm. In the case where our staff member set off the alarm, we actually moved his desk so it wouldn’t happen again.

2. Open the window

The air will help dissipate the vapour. For maximum safety, blow the vapour outside through the window.

3. Use a discreet device

I’d recommend using a device that doesn’t put out a whole load of vapour, such as a cigalike, a pod system or a pen-style device. You also want a device with lower power.

Usually , you should use a higher resistance coil (typically above 1 ohm), although some modern coils use resistances of below 1 ohm for Mouth-to-Lung vaping.

The Hexa Pro is a great example of a closed pod system which doesn’t produce a whole lot of vapour, but still provides a satisfying vape.

Hexa Pro

  • Compact and discreet
  • Leak free pod replacement!
  • Great nicotine delivery & smooth hit
  • All day battery life
Hexa pod system

Another option is the Smok Acro kit. The Acro is recommended for use at 12-15 watts, and with high PG e-liquids, which makes it ideal for more discrete vaping.

Smok Acro

  • Discreet but satisfying vape
  • Ultra lightweight, ultra slim
  • Long-lasting 1000mAh battery
  • Adjustable airflow
  • Auto & manual draw options
Smok Acro

Even if using a discrete device, you should still take care to keep vapour away from a smoke alarm.

4. Use high PG e-liquid

It’s also worth thinking about the e-liquid you use.

High VG e-liquids produces larger clouds of vapour and is not suitable for discreet vaping. They also work better with powerful devices, and not with the discreet devices we’ve featured above.

Instead, choose an e-liquid with more PG. Examples include Halo Vapour Co, which has a VG:PG ratio of 50:50 or VapeMate, which has a VG:PG ratio of 30:70.

Wrapping up

Don’t believe people who tell you vaping can’t set off fire alarms.

It can – and it has got a number of people into trouble.

The best option is to follow vape-free policies. If you are vaping where you are allowed to – ditch the sub-ohm mod for a while and use a discreet device that is less likely to set off a fire alarm.

And whatever you do, don’t blow vapour into the smoke alarm!

Have you ever set off a fire alarm with an e-cigarette, or do you know of someone who has? Let us know in the comments.

53 thoughts on “Can Vaping Set off Smoke Detectors? The Definitive Answer”

  1. Michael J. McFadden

    We used to have Saturday night poker games in my small and (in the winter) fairly unventilated kitchen. Usually about five regular smokers playing, and never once set off the smoke alarm that would scream when I made toast.

    Smoke alarm scares are often hyped in order to get people to cooperate with bans. Unless the smoke detector is a new version with high sensitivity, or there’s a LOT of smoking going on with no ventilation, or you blow smoke right at it, it’s generally not going to go off. Smoking OR vaping in the tiny airplane bathrooms, particularly since they banned smoking and just let everyone stew in their collective respiratory diseases, could well set them off nowadays though.

    Heh, and I just saw, in one of the ONLY two references to smoking of any sort in the first dozen or so episodes of the new Hawaii Five-Oh : It’s a Federal felony if you DO get caught smoking in the plane bathroom (not sure about vaping) … but if the plane makes a landing because of it, be ready to pay thousands in costs.

    – MJM

    1. Absolutely, as I think I mentioned in the article Alan told me that modern fire alarms are specifically designed not to go off because of cigarette smoke, but it’s a different matter in planes which have very sensitive alarms. After doing the research, my conclusion was that setting of an alarm with an e-cig is both rare and unlikely (in most circumstances) – but it is possible and vapers need to be aware of that possibility.

      1. In my case a passenger told crew that I smoked in toilet…apparently they smelled the smoke, kind of weird ad my ecig didn’t smell at all, no alarms went off…no crime committed but nevertheless arrested taken to court dismissed and held up for 36 hours in Doha jail

      2. My ecig sets off my smoke alarm regularly . It is driving me insane.

        It did it this morning as I came out of my bedroom to use the bathroom and then again when I opened the door to go back in.

        This was at 4 am so husband not right happy.

        They are mains alarms and over 10 years old so I’m wondering if they want replacing.


    2. My landlord just installed my smoke detector last night. I have 8 ft+ceiling. With in 10 minutes I had set off the dector 4 times. I am only 5ft tall so I was not close to the detector. I was not trying to blow clouds although I do use a long inhale. Now this morning I set it off again at least 45 seconds after vaping. Reading everything here it seems that my landlord picked this detector on purpose, due to a lease that didn’t mention smoking period. This is just a way to force me to stop even tho I wasn’t told this before I leased. I guess I just have to become aware of where I blow the vape and maybe use “the Fart fan” (my uncle gave it that term) in the bathroom to disperse the vapor. I would not have signed a lease here if the terms were given to me in advance. So yeah this must be a super smoke detector made to detect vapor. I am a little upset about this. I guess I will learn to work around it. How many times will I set it off accidentally, by just not paying attention. When u r watching TWD at 1am and just pick up your vape like normal, because its automatic and a hard habit to break? Wish me luck lol?

    3. It’s not all hype. My wife just set off ours in our bedroom, brand new (less than a week old) First Alert smoke detectors I just put in the house. The window was closed and the fog was quite thick when I went upstairs to see what was going on.

      I just put the smoke detector in there because I got a new furnace and had to add a couple of detectors in order to meet code. That is the first time in 4 or 5 years we’ve ever set off a smoke detector from vaping, even with both of us in the same room prior to me quitting.

    1. I’ve vaped on many planes in the bathroom – on both domestic and international flights (US, South America and Europe). I am always SUPER cautious however, inhaling small amounts, holding it in as long as possible and then blowing it directly down into my shirt towards the ground. I’ve never had any problems but, as you can see, I’m still researching it so I’m still not over confident. Just thought it may help to share my experiences. BE CAREFUL!

      1. I’m frequent vapor in long flights, I often travel in business class. So what I do is to cover myself inside the blanket sheets the give out and enjoy vapping inside, even my neighbor couldn’t notice that.


      2. I should have done it down my shirt…!!! i thought afterwards…but dont on delta mine went off it was taken until we landed, the pilot was mad and i felt SO STUPID… of hte nice flight attendants said their smoke alarm is sensitive….but before that i tried on Jetblue and it didnt go off lol

    2. That was my thought as it is only the landing 1 I set off not the 1 downstairs so I may be able to vape in bed without waking the whole house at 4am x

  2. I just vaped right now on a hotel and it triggeres a smoke detector.. i had to pay a helfty fine.. it sucks tho.. lesson learned not to vape anywhere where there is smoke detectors. I do chunk out big clouds tho. Really frustrating trying to explain to the receptionist that its different from tobacco smoke and it woudnt leave an odor. But since i triggered a smoke detector it caused panic to the guards. Luckily that it was just a smoke detector warning

  3. I myself have used a vape pen on a commercial airline flight from NYC to London, I was discrete and went to the lavatory , I held in the puff for a long time and blew the remainder vapor into my shirt. I preformed this 3 times during the flight and did not set any alarm off . Make sure you are not blowing the vapor at the dectector directly like a clown and you should be fine

  4. Got to work a little late. In the elevator lobby took a huge haul off my e-cig waiting for the elevator. Blew it out upwards so the cloud wouldn’t be noticed if somebody got off the opening elevator doors. What was above me? And in every commercial building elevator lobby in America? A smoke detector. As I entered the elevator cab the WHOLE building went into alarm. Hundreds, maybe over a thousand people came downstairs stood outside and waited for the fire truck to leave. It’s a big building, a cafe with cooking, manual pull stations to put the building in alarm etc. so could be complete coincidence when I stepped in the elevator. It could have been anything. But do I think it was my vape? Yeah I do. And I’m not fessing up. At my desk vaping right now.

  5. Like some of the guys above.. i use e cigs on plane all the time on long or short flights. I would inhale and try blowing out in small amounts into my shirt so i can barely see any vapour floating pass the shirt barrier. I will do this just enough so my cig urge is gone.

  6. Last week i set off the entire fire detection system at the Camino Real in Vera Cruze Mexico. Luckly when 2 managers and security showed up to my room, there was no smell left. I acted totally surprised and a little annoyed and they let it slide. So IT CAN HAPPEN….if your pushing phat clouds, go in the bathroom.

  7. Hotels are easy if your a cloud chaser do it in the toilet, but generally your fine if the kettle or the shower won’t set the alarm off why should a vape

  8. Last week my friend smoked traditional cigarette in the living room – No alarm at all
    Today morning I had some vape, alarm started beeping….. came late to work and get angry.
    Smoke alarms 99% makes life harder
    1% save your valuables or whatever.

  9. Aghhhh, I’m so frustrated. So last week my landlord busted me smoking cigarettes in my room. The fire alarm went off while I was at work and the fire brigade were called and my building had to be evacuated. My landlord decided to let it slide and I was so grateful, so grateful in fact I decided to through my cigarettes in the bin and buy an e cig. The whole building has just had to be evacuated again because the smoke detector went off in my room, it’s very possible I’m going to get evicted lol.

    1. How did the detector go off if you were at work? Lol and if it did it wouldnt exactly be your fault would it? Unless im mising a key factor here.

  10. Just set off the smoke alarm in my house with a vape beast tank lol. I blew it at the window but it didn’t work. If you’re sub ohming hard then be careful.

  11. Whenever I walk down stares I can’t vape other wise I set off the smoke alarm. It goes off by it self after a good 2 or 3 seconds but I set it off enough times to wake my family up

      1. Was there any consequence for your friend, I’ve done it in work today and I’m under investigation. Really worried about potential consequence.

  12. Just was vaping away in a Premier Inn hotel room when I suddenly spotted a sign no smoking or vaping. I was doubtful but luckily I found this webpage before getting myself into trouble. I guess I’ll just vape in the bathroom 🙂
    Thanks guys

  13. Set off the smoke/fire alarm at work about a year ago, I was vaping in the bathroom and not thinking it would pick it up. Came fire truck and everything. They had no idea what set it off and changed the detector and left.

  14. Just set a fire alarm off last night in a brand new hotel in Montreal. Fire fighters came and now they are wanting 1000.00 Canadian for the mis hap. I was shocked. I’m pretty loose with my vape and had no idea alarms could get set off plus I thought vaping in hotels was permitted. I mean why wouldn’t it be? Lesson learned. Hoping to cut a deal with the hotel manager but we will see. Careful out there!

  15. Hand Towel Master

    Since it’s a vapor and the smell doesn’t give off an obnoxious odor to others (like weed), I find that when on a plane (in my seat, NOT in the restroom) or in the hotel room (I travel every week for work, so I do it a lot), I find that if you blow the smoke into a wash/hand towel or pillow then you may be ok. And, of course, a fair distance from the smoke detectors. I’m fortunate in that I get to fly in first class so I only have a few possible neighbors to contend with seeing me do it.
    Yes, it’s annoying to have to do this with every puff but it satisfies my habit and I can take the bad with the good. And don’t try it with dry paper towels either – think about the fact that it needs to be something to easily absorb the moisture/vapor, like the person said about blowing it into their shirt. Personally, I’d be a bit more careful than just using my t-shirt, but that’s just me.

  16. Glad I came across this article after wondering if vaping at work might set off an alarm. I work in a datacenter, so setting off the alarm could mean Halon dispersal….. I won’t be trying to vape at work!

  17. I was on a southwest flight not to long ago, in America and I set the smoke detector off in the lavatory. I was using this tiny smok novo. I’m normally very careful. but I got cocky. So embarrassing. The flight crew rushed to the door. I opened it immediately and acted confused. They looked so mad at me. I denied it. Went back to my seat. When I deplaned, a Southwest lady was waiting for me. She asked if I was vaping. I denied it. But she knew. She told me never do it again, and gave me a pass. Very embarrassing. For now on I will hold the hit in for as long as needed, so barely any vapor comes out. So glad I found this article. I’m in a pretty new hotel, and there’s a star wars looking smoke detector on the ceiling.

  18. As much as I hate to admit this, as it was FAR from my proudest moment, I set off an alarm in an airplane bathroom by vaping. I had only taken a little hit and held it in for a while before letting it out, so it was a teensy bit of a cloud (wouldn’t even call it a cloud), but that puppy started blaring the second I blew it out! I regularly vape in my house, as well as my office, and never had any problems so assumed the same would happen. That’s what I get for assuming. And I consider myself EXTREMELY lucky for the fact that all I received was a stern talking-to by the flight attendant, as well as many many disappointed looks from my fellow passengers. Deservedly so in my opinion. Trust me when I say I learned my lesson that day!

  19. Staying at a Premier Inn right now. Took a small vape in my room the second the door was closed then spotted the no vape or £100 fine sign. 👀
    Straight into the bathroom, door closed, blow vapour down the bath plug. No screaming alarm, no hotel evacuation, no angry manager beating down the door – winning at vape life!

  20. A very interesting site. I have a Philips air purifier which measures pollens and particulates down to PM 2.5. Vaping doesn’t even register. I can ‘tho see when 16 yo daughter smokes cigarettes surreptitiously in her bedroom as the pollutant data report Friday m the purifier goes off the scale. I haven’t told her yet I know what is going on! . Be careful on planes and vaping near “new” detectors in hotel rooms. The infrared version will “see” the vapour and it is a good excuse for the hotel to charge you £200. There will never be an infrared detector in hotel bathrooms because the steam will set them off. Enjoy vaping.

  21. I lived in a house with 16 other males. A halfway house for recovering addicts. The doors would lock electronically at 10 pm so no one could leave until 9am so I would vape in my room to hold me over till 9am. All of the house mates would buy juice from me when they were broke because i would front it to them 😆 was a great side hustle, like coffee or tobacco in prison. lol we had just gotten a new guy and he was having a hard time with the no hags until the morning deal so I offered to loan him a vape until he got his check. We went over the does and donts, he asked about the smoke alarms because there was at least one in every single room in the house and many had 2 or more. I told him that i had been vaping in my room since day one and there was no way the detector would go off 😔🤥 he had never vaped before and excited to give it a go. I fronted him some juice and he went back to him room happy as can be. It wasnt even 3 minutes later and the alarm goes off. He comes running in my room out of breath and as white as a 👻. Says the first damn hit he took from it laying in bed set off the detector. It was a HUGE ordeal when they go off there. Everyone has to evacuate the house just like in school. It automatically alerts the fire department and they have to come and sweep the whole house and reset the alarm,we had to stand out in the snow until they did to. Its also a 2500$ fine. I kept saying it was just a coincedence beause I smoke in my room all night long. Nope, theres a box in the main entry that has all of the rooms on it and a red light tells them what room set it off. It was him. He got kicked out over it to. Still feel horrible about that to this day. Every time a new guy would come in after that every single house mate including myself would lecture him about not smoking or vaping in the rooms

  22. I work in aerospace industry most of those will not detect your vapor if your not a moron just vaping like normal you have to ghost it sip it like wine hold it in as long as you can and slowly exhale down your shirt by that time unless your using a whopping device it should have dissipated enough that the particles are no more detectable in the carbon dioxide in your breath but like I said if you using you regular huge device vaping like your chillin in a cafe outside which is plain dumb on a flight sorry be smart duh you’ll set it off flight attendants who have singed coffee have set it off and they say we test those things regularly but the guys who checked for BA and AF when I was an intern were lazy af and barely every did anything and some haven’t been updated since the 90’s even though it has been mandated airlines are quite shady they push it until they get caught fyi as staff we complain and report but nothing every happens until something actually happen if you know what I mean

  23. I just recently went on a long flight, and I felt more safe vaping at my seat next to people rather than the lavatory. When I used my vape device In the lavatory I bunched some toilet paper together and took my vape hit held it in longer than usual and blew it into the toilet paper and no vapour dispersed. But when doing it at my seat in the plane I had a jumper kinda scrunched up, mostly everyone was sleeping, I was in economy, and I’d turn my head into my travel pillow and take vape hits and blow discreetly into my jumper.
    No alarms and no snitches.
    Arrived at my destination – no one was allowed to go to smoking area or leave the lounge due to quarantine restrictions. So I vaped in the bathroom and blew the vape into scrunched toilet paper. No alarms no snitches.

    Military escort to bus to take us to hotel to isolate in – vaped in the bus and blew smoke into my jumper. No one noticed.

    And then arrived at hotel, not allowed to leave room until covid tests come back negative, no windows to open and smoke alarms in both the room and bathroom so I’ve been just blowing my vape smoke into my robe or down below the bed and no alarms have been set off 😀

  24. I stealth vaped on the new Great Western Railways IET trains a couple of years ago in the toilet. Got back to my seat and a warning came over the tannoy not to smoke in the toilets, including the use of e-cigarettes. Never had that problem on the older high speed trains. I regularly travel from London to Penzance, a journey of 5 and a half hours. If going by train in the day it’s best to just take some Nicorette quickmist and use that instead. I much prefer the overnight sleeper service to and from London and Penzance now because, although each cabin is fitted with a smoke alarm, you can safely vape towards the bottom corner of the cabin bed or even under the duvet. A few quick vapes before going to sleep and then before you know it next morning arrives and it’s not long before you’re off the train and can do what you like.

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