Smoking cigarettes is also quite legal, and also prohibited under the lease.I think your argument on unit count is a red herring here. 

While I use it primarily for noise concerns (it alerts me for sustained +80 decibels), it's also handy for cigarette smoke and tracking temperatures (in addition to our Ecobee thermostat)- sensors on all exterior doors and possibly windows (which you might have via smart locks for the doors)- exterior camsA recent guest for reasons only known to them set the thermostat to cool and 60F in the winter (where it's currently a balmy 11F). 

How about a cigarette machine?

Dude STFU, the wind was absurd, you weren't here, a lit cigarette would have burnt down the Eiffel Tower that night.

Hmmn.. maybe you should actually advise your pre-Covid operator friends to stop churning out Covid syndicators from their boot camps like it’s a pack of cigarettes.

I doubt weed smoke is different from cigarette smoke.

I just bought a Minut to put in a unit where I know the tenant is smoking cigarettes but I have a tenant that we ALWAYS see smoke his cigarettes outside yet when we go in his unit it stinks like marijuana.

My STR has a private backyard so I am able to treat it the same as cigarettes - outside only

We figure he must’ve been smoking a cigarette. 

Looking for something to detect Cigarettes, Vaping, Marijuana, Hookah, etc.