Yep over the years I have met many people with the story about the person with latent schizophrenia who switches from functional to extremely ill after a single LSD trip. I knew someone like this in my youth, and have since heard about many other cases. One of the more famous examples is the musician Daniel Johnston.

LSD is powerful and not to be messed around with lightly. Yes, it's not heroin or meth. But it's a powerful chemical whose effects can vary wildly from person to person and setting to setting.