maybe but it is rare. Let's remember that until sufficient research is done by governments and notable authorities we are always in the dark. it is a possibility as it is a possibility of having flashbacks after going to a war or any other very tramautic experience.

I shroomed thrice over 2 weeks and all I can say is that it is true that every time I did these shrooms I had at least 30 minutes of being sad. This was always followed by extreme happiness though. I always thought "I'm gonna be different tomorrow" and I did not want to be different. Despite this the next day u will wake as u normally do. Life goes on after the trip. I couldn't imagine on a responsible shroom dose ever having flash backs. The only way I can think it could happen is if one misjudged there trip dose.