The great majority of pot smokers I've known have been harmless, a little sleepy, a little dopey, maybe a little silly.
When I was a child, I knew a man who was schizophrenic. He was a Vietnam War Veteran, and from what I've heard from family members, he was haunted by his memories of the war.
When he was sober, he was an extremely talented wood worker, a helpful neighbor and friend.
When he smoked marijuana, he was crazed. He was abusive, reckless and scary. Marijuana had an effect on him that was not normal. He just went crazy. I mean, crazy.
I've never seen another like him. I was too young at the time to know about marijuana, but others who knew him as adults have told me that's what happened. They had never seen anything like it, either, from smoking marijuana.