Marijuana helps induce cell apoptosis, which is the naturally occurring way cells die in your body. Cells that don't di when they're supposed to and then replicate are what turns into cancer. This helps with that but you can get the same effects from hemp oil and products without thc in them. I would argue smoking is dangerous regardless of the substance. Make a brownie or something but that could be dangerous as well lol. So could driving your car which is proven more dangerous then most other activities we do yet people still hop behind the wheel of a car every day without question.