Why do people judge marijuana as a toxin?

Because it's a toxin: The myth that marijuana isn't a neurotoxin just won't seem to go away. Marijuana is a toxin. The evidence of it's toxic effects is overwhelming. There are dozens of well performed research studies showing adverse effects of marijuana. By the way, it's not only toxic to the users themselves, but marijuana use can also harm the brain of the users' children. I wish you the best.