Some people have flashbacks to suppressed abuse memories when they have smoked some truly powerful herb for the first time. One person I knew who that happened to had a full blown shock reaction with skin ice cold to the touch and feeling they were going to die. Something like that could be considered a psychosis probably but it's the trauma surfacing that is the problem. Without having to deal with that it would be just a great high. Cannabis might lead the person to see through some their mental walls first though. It helps the person to begin to process trauma. That's why many people find it is good for PTSD.
Some people have flashbacks to suppressed abuse memories when they have smoked some truly powerful herb for the first time. One person I knew who that happened to had a full blown shock reaction with skin ice cold to the touch and feeling they were going to die. Something like that could be considered a psychosis probably but it's the trauma surfacing that is the problem. Without having to deal with that it would be just a great high. Cannabis might lead the person to see through some their mental walls first though. It helps the person to begin to process trauma. That's why many people find it is good for PTSD.