I use a vaporizer about 90% of the time. Dirty raider was right about the two types. I have owned both and know from experience to stay away from the cheap ones with the metal plate and the glass dome. They will get you high but are not very efficient. With the one I have now I need only a little bit of bud to get really stoned. It is an Aromazap and set me back $100. Sorry but this seems to be the min price for a decent vap. There is one that looks like a pipe that seems like it would work well and goes for about $50. I've never used one though, so I can't vouch for it.

As far as being able to smoke in your room, remember, your'e not really smoking. No smoke is produced, just a vapor. I've had people walk into a room a few minutes after I've used my vaporizer and never known. If you have good bud chances are it will smell stronger than anything you get out of the vaporizer.

I'd recomend just dropping the $100 and getting a decent one. They are a lot more efficient than smoking so you'll probably end up spending less on weed. After a few 1/4's the vaporizer will have paid for itself.