There are four main risks for most people: - PTSD caused by bad trip. Bad trips are not uncommon, and it's not easy to let go. Part of the reason why psychedel

There are four main risks for most people: - PTSD caused by bad trip. Bad trips are not uncommon, and it's not easy to let go. Part of the reason why psychedelics are so effective is that they basically force you to let go, otherwise you will have a bad trip. But some people can't do that, I couldn't, and you can end up causing long lasting psychological damage due to this. I had an existential crisis and became pretty suicidal for a few months after I had a couple of trips. I actually had to take up a religion to cope with it. The therapy services in the UK had no idea what to do to help me and made me feel alienated - DP/DR (depersonalisation/derealisation). Can be short lasting, can be long lasting, can be flashbacks, can be constant - HPPD (Hallucinogen persisting perception disorder). Described as anywhere between "visual snow" and "you never came down from the trip". No one knows why this happens or who it happens to, if it occurs differently with different psychs. Many people commit suicide over this one, since it can basically cause psychosis as some people never stop having intense hallucinatory effects for months or even years. If they can't come to terms with it it can be extremely disorientating and alienating. Andrew Callaghan of Channel 5 news / All Gas No Brakes has this. Kind of frightening since it's most trippers' worst nightmare to never come down from the trip, but that's actually a thing that happens to some people - Flashbacks, which I would say are different to the other three, in that they are a sudden return to the tripping state of mind randomly, but not necessarily visual or DP/DR. I think this one is the least explored and least well known about