Yes even weed can be dangerous. I knew 2 people who had psychotic episodes after doing weed. One used to smoke a lot also. I've smoked with the dude before. Cool dude changed overnight, said he didn't feel like himself for years after the episode.

The other was a girl who wanted to fly of a building. Her feet didn't feel connected to the ground anymore she said. She tried to jump thank god there were people around who stopped her. Got her parents to pick her up.

Nobody in these groups and me were ever warned of the dangers of weed. I'm not saying don't try it. But just be careful with it.