I don't do anything, I just use a bowl and make sure all smoke goes into my lungs and out of my lungs out the window. I have a screen on my window so I can't get out I just blow through it. There is a smoke detector(maybe) in the hall, but usually no smoke is in the house afterwards, it all settles. If you're smoking a joint, then the smoke will run though, that is a problem. You'll need to put a towel under your door when you close it so smoke doesnt go through. You'll just have to hope your parents dont come to your room. There is another better method though. Here it is:
Go to bathroom, and turn on shower, set it to the highest setting so that there is steam, then turn on the fan, then toke and exhale the smoke into the shower. Leave the shower on for a few minutes after, and after turning off the shower, leave the fan on for a few minutes after. Take about 15 minutes for the entire process. Make sure any ceiling vents are closed and towel under door. Doing this method with a joint is risky, just unroll the joint, and pack the bowl....