I have a tenant in one of my houses that is a smoker.

I really don't want smokers.

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

No animals or smokers.

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've never encountered a smoker who didn't smell like smoke at a showing, who passed my other criteria, and then showed up on move-in day smelling like smoke. 

that is a preference thing, personally I dont mind, but we dont have carpet in our properties, well 1 of 8 does, we charge a little higher rent to off set the pets, yea they can do damage, but so can dogs, and smokers, and dirty people, its all part of the game, you will open up a huge number of potential renters if you allow animals. just my opinion

Pot smokers, partiers, people fighting/screaming/throwing things at each other, dogs that bark and howl all day and whine all night, unsupervised teenagers lighting backyard bonfires in the bbq grill while mom away at work, etc.  

I go with 3x rent, no smokers, no cats, no evictions, credit score of 600 or higher, positive references from landlords for the previous 5 years and I say occupancy is limited to 2 people per bedroom.

Smoker aren't a protected class.