My guys are big and burly, they drive jacked up 4x4s, chew tobacco and have neck tats.But to answer your question, I wouldn't do an STR in a bad neighborhood area for tourists.

I cleaned mine ok with lots of tedious caution and a little flash light, but am hesitant to recommend it as a DIY service to others since it was harder than I imagined and since I believe many AC companies will come do an annual service with coil cleaning for around $150 (again, just guesstimate) and likely have a method more foolproof than my aerosol cleaner can and garden hose, plus they can look the system over and catch/fix any small issues before a home inspector would find them. 

IF Not and if the only information you are getting is from the program itself, just remember that the Tobacco companies used to tell people smoking was safe and turned out all kinds of statistics in their favor.To know if a program is worth it, you need to know the success of it's graduates.

However I do have zero tolerance for growing, excessive smoking of anything inside to the point of bothering the neighbors, and of course tobacco use inside is grounds for swift and relentless punishment because nicotine smoke causes actual damage to the property.

Several household materials were evaluated for the capacity to block bacterial and viral aerosols.

Whatever residual nicotine remained on the walls and ceiling from tobacco use from previous tenants has now been covered up by your painting.Gail

It would be extremely unkind in my book.Having said that YES you can determine if they are smoking pot or tobacco.

They have neck tats and chew tobacco in their sleep. 

I'm glad when the only vice my drywaller or painter has is tobacco! 

I inherited a tenant who smokes,  and the house reeks of tobacco.