dirtyhippy420
10-26-2005, 03:32 AM
A U.C. Berkeley approved research project published by Erowid. It takes a while depending on your answers but if you don't mind helping the scientific community understand the effects of drugs, take the survey (https://erowid.org/psychoactives/health/hppd/hppd_survey2.php?FP=/psychoactives).