i live with my parents and i had the same problem... i would blaze in my room and my sister would run in my room and say, "Pot smoke is coming through the vents!!". i have my own bathroom connected to only my room, so i blaze in my bathroom. i put a towel under the bathroom door and on my bedroom door that goes into the hallway. i blow all the smoke into a spoof that i made out of a paper-towel roll and fabric softeners. spray and then scented candles (if needed, but i usually don't have to).

also, i run the bathtub after im done smoking so that if anyone knocks on my door, theyll think im in the shower and that leaves time for the room to air out.

ive been smoking in my room for 5 years and still havnt got caught