I've definitely had the mari jane tripping thing happen to me. And I've smoke a coupla different type of laced mj bags. One type my friends and I believe was "dust" and I must admit. We loved the stuff. When I used to do Lucy I used to have flashbacks once in a while. Not the full blown trip, but just the feeling. There was a time that I would see things "breathing" all the time not quite everything, but when looking at someones lawn, it would just happen everytime automatically. Now that I consume shrooms, I've noticed that when I have the right situation going, I get a little of that shrooms flashback feeling. I felt it for the first time this morning. It was sort of weird, especially since I was waiting for the bus. It was bugged me out for a few minutes.