1st step is to dive for the recirculation button to make sure it's off. Once that cigarette stink gets sucked into your vents it takes hours to go away. If it's really bad I'll crack a window, but the problem is I hate driving on the freeway with a window open. Seriously though smokers are always inconsiderate. They obviously don't realize how bad they make everything smell, and they definitely hurt our tips. I've heard from tons of people I know that always just assume the smell is from the driver smoking in his car and they hate it. Not realizing it most likely is from the pax who got out 30 seconds before they got in. And the worst part is since they use waiting for a ride as an excuse to smoke, they are always toes to the curb, so you can't even shuffle them.