A common question for pot smokers, especially those still living at home with parents, is “How can I smoke without stinking up the house?” Being a pot smoker and still living with mine, I’ve asked this question many times; Thankfully, I found the answer. Now I’ll share it with you:
Make a Sploof!

Step 1
All you need is a toilet paper roll and a couple of dryer sheets.

Step 2
Crumple a dryer sheet into a ball.

Step 3
Stuff it inside the toilet paper roll.

Step 4
…Repeat.

Step 5
Voila! All finished.
When you take your hit, blow the smoke out through this instead of just out into the open air. The dryer sheets will absorb the smell and anyone passing by will just think you’re dryer fresh.
You can also tape some dryer sheets onto the end of the roll if you prefer

http://sweetleaftribune.com/diy/spoof