It's a hard thing to try and reconcile, isn't it, Potastic?

My belief based on everything I've read from the researchers who've done the most looking into the correlation between weed and cancer is that weed itself does not cause cancer. The THC and CBD in cannabis have very promising anti-cancer action in mouse studies and it has really amazing untapped potential as an effective cancer treatment. There's a Spanish researcher right now doing research into the effects of THC on glial cell cancers, which are the type of cells found in the most deadly forms of brain cancer. In mouse studies, THC has been shown to kill glioma/glial cells, which is great news for mice with brain tumors and possibly great news for humans, too.

Here's the hitch, though. Cannabis seems to be a remarkably healthy substance, at least for most people. But the by-products of combustion are still carcinogenic. In biopsies, people who've smoked lots of cannabis over long periods of time begin to show histological changes (tissue changes) that might be the early warning signs of future cancers. Weed itself has great anti-cancer properties, but smoking it still unleashes those byproducts of combustion. This is why most clean-living cannabis purists prefer to vape or eat it. Because even though the weed itself seems to be healthy, burning it and breathing in those byproducts of combustion isn't.

Frankly, I think compared to some of the other risks humans face, like higher cancer risk from obesity, exposure to environmental pollutants, overexposure to radiation, etc., even the risk of cancer from smoked weed seems fairly negligible. Still, if I were going to use it every day, I'd probably vape it just to be safe.