[BlindedByScience]

Guys, no dis, but I have yet to see any "bathroom fan" with enough CFM to get it done....and I've seen several smoking rooms where guys attempted just that. One room where the guy installed THREE bathroom fans. It was loud as hell and didn't move nearly enough air to clear out the room.

mosesbotbol hit the nail on the head - it's all about the makeup air. You can get it done with a window fan that has two fans; set one to pull air in, the other to pull air out...but booster fans will do it better, faster, and with less noise. If you have two vents coming into the room, the hard work is done. Get some HVAC booster fans and set one to pull air in, and the other for exhaust....you should be golden.