I've suffered from depression, low self confidence and substance abuse (marijuana) problems... even recently.

Is there anyone here who mandates HEPA air filters for tenants using medical marijuana in states where it's legal?

Aloha,Depends on the actual verbiage of your Rental Agreement, but "NO Smoking" means no smoking...of cigarettes, pipes, lawful medical marijuana (they can get edibles), ditchweed, or any other tobacco products, and they would be in violation of the terms as stated.

What about petty misdemeanors 10+ years ago like possession of marijuana?

I realized that the tenants are heavy marijuana smokers and have permeated the smell to my other unit.

Yesterday Ohio legalized recreational marijuana.

Similarly, marijuana legislation is discussed pretty much every year, but rarely ever enters serious conjecture because we're still just very conservative politically speaking.

Not sure what City you're in but I no longer recommend complaining tenants contact the police because they're recently taken the stance that not only will they not do anything about noise, marijuana/illegal activities, or dogs (they won't issue citations or even enter units) but they are going to begin issuing nuisance fines to the property owners. 

You would think that those are no-brainers, but you can run into an individual now and then who says they need to smoke marijuana for medical reasons or they are blind and have a guide dog.   

Although oil plays a very large role in the Alberta economy, the main cities of Calgary and Edmonton have been doing a lot of work to try and diversify their economy via attracting tech companies, the booming marijuana sector, as well as health care, post-secondary education etc.