It is retarded to smoke in the middle of your dorm.  But to those who are daring (stupid) enough to smoke in the middle of their dorm here are some precautions:

1.  always, Always, ALWAYS cover the bottom of your door with a towel (ive seen a few people duct tape all the cracks in the dorm while they smoke)
2.  Get lots of air freshners (From experience, OZIUM works best because its a Kamikazee air freshner. It kills the smell instantly and then kills its own smell).
3. Try to blow your smoke out the window (self-explanatory)
4. Be able to get rid of all evidence within 15 seconds.  You don't want to keep the RAs waiting (its suspicious; thats why the bathroom works best because you can blame your delay on showering).

If you live in Weinstein dormitory (which i did) then you can make a great smoking nest by putting up a drape in front of your door and having a fan pointed towards the window.  No one will ever know!