What're they gonna do -- barge in on you while you're in the john and then land the plane where ever they're at just to kick you off? LOL
I don't think it'd be that big of a thing, even if they did for some weird reason barge in on you.
Well now a days they can arrest you for pretty much anything in-flight... including causing a disruption or interfering with flight crew.
And by kicked off, it could mean no return flight, or no connection flight... perhaps banned from flying Air Canada again.
The smoke detectors aren't really there to catch filthy smokers... they're there to warn about a fire. If it goes off, it's taken pretty seriously, and I wouldn't even be surprised if it's standard procedure to reroute the plane to the nearest airport.
My advice, and the consensus on ECF
should be to follow airline policies and not rock the boat. What did you do before vaping? Smoke on the flight?
I'm not saying it's intrinsically wrong to vape on a plane... just saying we should respect these policies, just like any establishment. Last thing we need is someone getting fed up and pushing a public no-vaping law.