Studies have shown that marijuana is one of the safest, non-addicting, and peaceful "drugs". Over 200 diseases and conditions respond favorably to cannabis, as many studies have shown, including cancer, arthritis, depression, and HIV. No one has ever died of marijuana use, and no violence comes from its use.
In fact, the only negatives of using marijuana as of now come from the fact that there are HUGE legal sanctions, that truly are not justified. The only reason marijuana is illegal is to protect the profits of pharmaceuticals who want to sell their high-fatality-risk medications and cannot control the cannabis market. Stop with this corruption.
Marijuana is an amazing plant, with even more amazing benefits. If it has negativities, I'm SURE they are not as bad as alcohol and tobacco's.