Grew up in the 70's when acid was king, lots of people had "flashbacks", almost like reliving the trip. Some never got it. I've seen way too many people getting wasted on drugs, can't believe they don't protect the only thing that nobody can touch: their mind. Expand your conciousness with music, mediation and becoming solitary. This is true expanding and you can go there any time you like. Drugs are temporary. Anyone can hurt your body, only you can hurt your mind. It's precious, guard it and don't let anyone or anything mess with it. You are out of control if anything can affect your mind. Lots of us have gotten good results with rhythmic drum beats, looking into water, breath control, etc. Try it, it will give you a new conciousness.