Yes. Absolutely. My partner abused magic mushrooms. He and I had the most exquisite, transcendental experiences on LSD together. Truly lifechanging. But after that, he became consumed with the desire to keep experiencing that transcendental feeling. And so he would take weed edibles every day, and on weekends take a large quantity of mushrooms. Until one day he had the most terrible bad trip, and he lost his mind. And during that delirium and psychosis, he hallucinated he was back in Afghanistan, and that someone with him who was tripping, was a murderer trying to kill him. And he shot them to death thinking it was self defence. Now he's in prison for manslaughter. It took him years to stop having delusions after that night. He was almost schizophrenic for years afterwards.

Psychedelics are not harmless. They can be dangerous. Especially if used too much. Especially if you have a pre-existing mental illness.

The only time I ever had a bad trip, was when I took mushrooms carelessly, because I was bored and wanted an interesting "altered state". I didn't have a real intention, I was just wanting to escape "normal life". And I was trapped in a thought loop for hours, unable to stop dwelling on a paradox. And my memories came at my out of order, and I started to fear I would never be able to exist in normal society again because I wasn't able to perceive linear time and I couldn't distinguish memories of real events from memories of dreams.

Fortunately I was in a safe setting so I just lay on the floor for hours until the high subsided. But I've never taken mushrooms again. And I only take LSD very rarely, every six months max, with a clear intention for the trip.