yeah, enough with the proselytizing. hallucinogens can be incredibly therapeutic and harmless. it all depends on the individual's personality and stability, the dosage, and set and setting.
i've tripped over 200 times on acid, mushrooms, mescaline, and ecstasy, and i've never had a flashback, nor a bad trip. i've had some strange experiences, but nothing scary or frightening, and i choose to immerse myself in some pretty dark music/film/art. it's all about altering perception, bending reality, and breaking down barriers, some of which are negative influences in life.
i'm pretty sure i'm a productive member of society with a job and multiple friends. and i last took acid on saturday while watching judas priest and sabbath.
read aldous huxley's "doors of perception" and "heaven and hell" (fuck it, you should read any and all huxley anyway). he was around 58 when he first started experimenting with acid, and died when he was 68 (on a dose of 250 mg).
careful regulation and moderation is the key with hallucinogens. not everybody should experiment with them, but in the right hands, they can be wonderful.