My mom gave me a truthful, honest description of all the drugs she's ever done, and exactly what effect they had on her. I credit this with being one of the major things that's kept me from ever bothering - most of her stories either end with "yeah, it wasn't worth the time" or "I stopped doing it because I liked it too much."

(I'll probably try marijuana once it's finally legalized, but I expect to end up bored - my biology is just too similar to hers for me to expect anything else.)