But you have about 2 choices in Portland now thanks to a completely lame ordinance  from a lame city council who want to keep tenants in their "homes" at all costs.   1) you can evict them on a violation of their lease (not paying, smoking, extra pet, noise, etc),  but they have they easily have right to stop the violation and stay.  

I would not want them as tenants if they caused the fire smoking.

Hi BP,One of my tenants keeps leaving the stove & oven on and the smoke alarms frequently go off...

Renters have some obligation to maintain the home while they are living there, this includes light bulb replacement, batteries in smoke detectors (although we are moving towards the 1 year lithium kind   where no change is needed) anything caused by tenant such as a plugged toilet, disposal, etc  Also pests like ants, fleas, are tenant repsonsibility is not detected close to move in. 

So, bought a 3br/2bath home in the smoking hot Bellingham WA market.

We've been doing some light rehab including:New flooring in laundry roomNew hot water tankFaux wood blinds throughouttouch up paint, where neededBringing some electrical up to codeInstalling a microwaveBathroom:  Grouting tub, replacing some damaged tiles, fixing exhaust fan, re-trimming window, new showerheadNew smoke detectorsPainting some built-ins in the basement that were bare woodFinishing off a bar in the basementPowerwash of exteriorNew address signNew mailboxRepair of interior and exterior doorsDealing with a disaster of a yard! 

Are there other provisions that are "never cross" lines - absolutely, like no smoking. 

Did one party bring a smoking deal to the table?

When they roll out of their vehicle in a plume of smoke, but tell you they will not smoke in the apartment (which was clearly advertised as non-smoking on the entire premises).

You may discriminate against smoking, criminal records, prior evictions, recreational drug use (though it's doubtful the applicants will divulge such information), pets, etc.