and that most can actually act 'normal' and deny it so much so that even their parents spouse or kids would swear they dont do anything 'but cigarettes' even when mj or harder drugs are indeed being used recreationally.i'd contact police to investigate (ie, what exactly is that white powder in my house?!) 

Scenarios of subletting, huge amounts of family members moving in, unlisted pets, AirBNB deals under my nose, multiple calls for trivial issues, smokers, hoarders, etc.

You may be able to put limits on the total number of humans allowed in the unit, credit scores above X for each adult, no rude people, people who smell like alcohol at 10AM, smokers, leather-wearers, vegans, etc.  

I don't allow smokers.  

The property is smoker friendly but the extent of his smoking seems over and above.

The cigarette smell lingers on the clothing of smokers and this smell seeps into the closets and interior of the home.

They overloaded the septic, cigarette buds by the thousands, boxes (with puke covered left by the 50,s.

But, they spend a great deal of it gambling at the local casino or on cigarettes or going out to the local bars or restaurants, etc., and they can't afford a car because of it, and are always looking for a handout.Then, there are those like me and many of my neighbors, who don't smoke, or go gambling or go out drinking or to restaurants, and always pay their rent on time, and have savings accounts,  and wouldn't dream of asking for a break.It's not just because a tenant can't afford to - or doesn't want to - own their own home, that a tenant ends up in a position to ask you to put up with them getting behind on rent.  

No animals or smokers.

The baby daddy moved in, they smoked in the apartment against the rules, and just dropped cigarettes everywhere - the carpet had burn spots all over it, it's a wonder it didn't burn the place down.