Alright, my two cents really quickly.

I believe some information is inconclusive, although I definitely believe your chances of getting lung and/or throat cancer are definitely much lower than that of tobacco use. I would go about proving my case, but it seems as though that has already been done for you above.

If you're worried about it that much, invest in a vaporizer, the electric kinds are best. They allow you to inhale the thc through warming the contents rather than reaching combustion temperatures and producing harmful toxins such as tar.

You can also eat cannabis. Start looking at the recipes forum. It takes a little bit more, but if you are really that worried about getting cancer, start there.

Everyone has to die. The question is, did they really ever live in the first place?