It's important to reaffirm before, during, and after the trip that you're totally "normal" and going to stay "normal". In my experience a "bad trip" is an anxie

It's important to reaffirm before, during, and after the trip that you're totally "normal" and going to stay "normal". In my experience a "bad trip" is an anxiety/panic attack through the lens of whatever drug you're on. I've had success nearly 100% talking people down by engaging the panic and looking for the root cause. Most of the time it seems that people have some underlying anxiety that weed/hallucinogens bubble to the surface. They're suddenly and unexpectedly faced with a completely new manifestation of their fears. "I thought weed was supposed to be fun? What do you mean it'll force me to think about my negative mental baggage???" It can be overwhelming if someone isn't there to talk you through it and explain that it's completely normal.