Hey Lily,

This probably isn't gonna be the answer you wanna hear, but just let them go with it. I mean, other people would probably feel the same when they hear that their friend/relative wants to try weed, but we all know that's just fucking dumb, right? It's up to them what they wanna put in their bodies, but you can help by showing them sites like Erowid and helping them to find proper information about the drugs they wanna take. Then maybe they'll change their minds, maybe they won't, but at least you tried, and at the end of the day it's always gonna be up to them.

Peace