A full paint job was usually only needed if someone had been smoking in there a long time.  

Make it part of your system to do an inspection every 6 months, where you check smoke detector batteries, filter, check for leaks, running toilets, etc.But, no, the appliances are your responsibility, unless you have a lease and state laws that allow you to make the tenant responsible.  

As for smoking, you certainly can put that in the lease.

Again whatever you feel comfortable with in terms of escalation here.No personal experience with this device and not sponsored, but I've looked into FreshAir Sensor previously for my Airbnb, and it is a simple plug and play device that detects cigarette smoke.

Coming soon: Commercial real estate is going to get absolutely smoked. 

Beyond that you've got constant fighting with the neighbors, layers of nicotine caked onto your walls, constant complaining, broken windows, no batteries in your smoke detectors, and a yearly Section 8 inspection that requires you to pay to fix a whole bunch of tenant caused damages. 

For example "No cooking grease, oil, animal meat bones, pasta, rice, any other substance down the garbage disposals except apple and carrot peels and liquids with no solid matter such as juice and soda" and "no vaping and smoking of any tobacco product, marijuana or any substance" on the property, including the backyard"  

I talk about this on my YouTue channel a lot and we get more and more people move to Milwaukee, many say they visited and where shocked how much they liked it and because of cooler climate, plenty fresh water, and lack of smoke, fires, storms, floods etcSidenote: took my wife to Chicago last week for a show and we got stuck in the suburbs for 2 hours trying to get on a freeway.

Know that all these people with stories will still be buying beer and cigarettes and have a couple dogs when they fall behind on their rent... 

As a General Contractor my liability insurer would drop me like a hot potato if they found out I let subs smoke pot or drink on the job.