Get a one hitter or a proto pipe (cause it has a cap)or a whitsle cap for a metal bowl and make sure you dont let any smoke come out of the bowl after you hit it.Do this by only putting enough stuff in the one hitter for 3/4 of a hit that way your sure to git it all.If using a metal bowl with a cap you just put your thumb over the hole so it goes out.Then slap that shit in your pocket and blow the hit through the dube tube and into the exhaust fan.The next important thing is make sure you have some gum,cinnimon works great.A spray of colonge or body spray also helps but just a little because too much may raise suspicion.If you do all that then your completely good to go for 1 or 2 hits without getting caught for smell.