I use organic soil, Bhudda grow and Bhudda Bud which are supposed to be organic as well. So I believe my leaves don't contain a bunch of extra chemicals. Most legitimate studies (there are very few) show that smoking pot is not near as bad a carcinogen as cigarettes and that smoking pot does not lead to enphyzema as tobacco can.

There is obvously something to be said for not smoking more than may be necessary to get high. If you are really worried about it you would only use a vaporizer to smoke. That is obviously not realistic for heading out to the woods and enjoy a doob while taking in the view. They make funky vapor pipes but it definitely does not compare to a volcano or other quality vapor machine which is not really portable.

You do bring up a good point that I had never thought of.