The evidence is becoming overwhelming that marijuana fights cancer. See below for a few more blockquotes on this topic but first, from AFP:

The main chemical in marijuana appears to aid in the destruction of brain cancer cells, offering hope for future anti-cancer therapies, researchers in Spain wrote in a study released Thursday.

The authors from the Complutense University in Madrid, working with scientists from other universities, found that the active component of marijuana, tetrahydrocannabinol (THC), causes cancer cells to undergo a process called autophagy -- the breakdown that occurs when the cell essentially self-digests.

The research, which appears in the April edition of US-published Journal of Clinical Investigation, demonstrates that THC and related "cannabinoids" appear to be "a new family of potential antitumoral agent."