You don't even have to actually smoke in the vehicle. After I "retired" I had a PT delivery job & one of the other drivers was a heavy smoker. The odor stayed on his clothes, & in the truck. If the employer could prove that you did - which would mean actually seeing you - they would dock you $125 for a cleaning fee. And after a vehicle is smoked in, it isn't ruined for "life". A professional detailer can take care of it. Same goes for a house. My wife & I are former smokers - I quit 18 years ago, 16 for her.