In Wisconsin, you should be using a Smoke Detector/Carbon Monoxide agreement. 

No smoking clause!

; can learn interesting things (for example, someone who claims they don't drink posting pictures of themselves snockered at different parties, someone who claims they don't smoke posting pictures of themselves with tobacco...or other products....they are smoking).

@Tralecia K Young smoke and mirrors.

High risk tenants have common denominators like animals and smoking. 

She's damaged the property with 30 years of smoking.

I like to stretch all my numbers out for 10 years for everything and that comes out to a savings of $600,000 every 10 years and since I am a plumbing contractor I will bet my cost to install the water heaters was less than $80,000 because back in those days water heaters cost me less than $100 and I had my own workers install the gas, water piping and smoke pipes.Your cost to install heat pumps that also give your tenants air conditioning may be less than installing a new boiler, fuel and maintenance.

I normally DIY all the way, but if I don't even have a lease or know the disclosures I need for my state or city (lead paint, mold/mildew, w/h temp, smoke / co2 alarms  etc) I'd get the best PM I could.   

Honestly, I would agree that it's really hard to give a silver bullet answer. 

I do a smoking outside only.