I got a vaporizer to keep my lungs safe. I think its pretty obvious that burning anything and inhaling it is never a good idea. Carcinogens are in most things that burn and carinogens cause cancer. I am skeptical of studies saying other wise. If you already have emphasima I would do anything I could to go easy on myself. Vaporizers of very high quality can be had for $150. My friend has one thats pretty good that only cost $65 but i can't imagine it will last long and has no warranty. Keep in mind that vaporizing extends your supply because its more efficient and you can even use the dried out nuggs for cooking. You will come out even based on the efficiency of it and will also be giving your lungs a break. I would use that as a daily smoke and hit whatever else if its passed to somewhere other then home. I have been sick only once last year when compared to the 7 times I usually would get sick when I was smoking out of a bong. CHeck out the hot box.

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this one is the one my friend has.

VP-400 Digital Ceramic Heating Herbal Vaporizer - VaporizerDealer - Herb Vaporizers & Tobacco Grinders