i've been a chronic smoker for 10years (15-25yrs), and developed a cannabis induced psychosis which was pretty nasty. I ve had two episodes so far which were dreadful, words wont suffice. I had 2 bad acid trips as well, and cannabis just kept triggering it off...i was diagnosed as a schizoid and infact expereinced derangement when tripping on acid, pot, ket and xtc. From believing in being the divinely invested master of the universe reponsible for earthquakes and katrina, to paranoia about getting raped etc. Sadly even after having recovered, I am a cabbage with no memory, concentration, wit, ideas etc. My advice is, if you ever hear voices on pot, quit it!