Are you installing new smoke alarms?

my ex tenant was picked up for smoking pot - I wasn’t held liable for that. 

I can assure you that there can be instances where you can set up note transactions that will smoke your calculator.

I don't see a smoking gun as of yet, I don't. 

(Everyone complains that they can smell each other's food and smoke and  in each other's apartments ) The building is in Northern Jersey where I believe the building is responsible to provide ventilation by law. 

And along the bay generally there is no smoke there :)  ANd if there was it would be quite short lived.

For example, you go to a high property tax state like Texas and you may find a property that appears to fit the 1% rule but once you factor in the $500/month property taxes and $100/month insurance your potential cash flow has gone up in smoke.

., smoke detectors, proper handrails).

The few that I looked at but didn't buy would have had to have all of the wood removed and anything else that smelled of smoke.

Smoking is definitely happening in a unit (leased rental unit, inherited tenants).