It builds up tar on the lining of the lungs. People who hold their hits are morons who dont listen to fact, as they are building up tar quicker than if they were to smoke properly.

THC cannot prevent cancer, although, in a study of 64000 people scientists found no direct link between extremely heavey cannabis use and any form of cancer, including lung cancer.

Also, THC kills free radicals [which are bad bad things] which can help preveny skin cancer, but as far as cancer goes, your never safe, EVER. People who dont smoke a single thing in their whole lives can get it.

Personally i smoke up to 40 cigs a day and over 10 joints a day. I know that im probably going to get cancer, and i've just about prepared myself for it.
LIP Reviewed by LIP on . lungs so supposedly weed prevents lung cancer(or so i heard). what does it actually do to your lungs negatively. is it just the tar build up? Rating: 5