Marijuana causes cancer. It has more carcinogens than tobacco.
Cannabis has carcinogens? You have a source?
Stoney Girl Gardens out of Portland has FB page. Occasionally they run a story of cannabis effects on cancer side effects as well as it effects on certain cancers.
Aloe Vera can also treat cancer, but the majority of the population does not know that the effective ingredients of the plant start to dissipate immediately when the leaf is cut. So if you use an aloe vera product it needs to be a stabilized form of the aloe.