Talking about cancer is really scary.
You mention the leaves of cannabis as a cure for cancer, I am very familiar with cannabis. In our area many communities are cultivating marijuana, but illegally, because the government prohibits cultivating any more ingredients.
Marijuana is very influential for health if wrong in use and at very high risk, one of the very harmful effects for people who smoke cannabis heart attack in a very fast time.
However, that puzzled me. Marijuana is also beneficial to health, even though the scientists / doctors Keep it a secret health benefits for cannabis.
One of the benefits of marijuana that I know is cannabis can slow the disease (Alzheimer's), this disease attacks on the brain.

Thank you for sharing, interesting and useful postings for our knowledge of dangerous diseases.