ehhwwww..... blowing smoke out the window is just askin for police probable cause via a conservative neighbor....

instaed put a sheet of fabric softener over a empty paper towl roll and strap it down with a rubber band.

and burn a little incense while you smoke.

No one will know..

this method is tried and true

of course I'd recommend doing this with a widow or air conditioner around so you don't die of carbon monoxide poisoning from the burning incence