don't know if anyone mentioned this as i've only read the first page, so if so, sorry, but i bought for when i smoke in the car, which is pretty much whenever i'm in it, lol.. a lil thing i saw advertised in i think it was skunk or hightimes called the smoke buddy... it's like a small hand held carbon fliter that you simply blow your hit through and it comes out nice and odorless.. pretty much the same concept as the paper towel holder i used as a wee lad, but a lil more sophisticated.. and the thing works pretty well if you're smoking bowls out of it as i find too much smoke gets into the air and stinks things up worse if you're smoking a joint or a blunt...
here's the link for it.. it's only like $20 and works pretty well like i've said..
http://smokebuddy.com/