I don't know much about them! Sounds like a few people on these forums have some experience or know some stuff about them and it's always nice to learn.
Edit: I'm just gonna ask we keep this on topic too! I haven't seen any malicious posts yet but I know this can be a controversial topic and I don't need to see 1000 useless posts saying drugs are wrong because that's what your CALM 20 teacher told you. They can be bad, they can be good, this thread isn't to debate if they're right or wrong - it's just to learn about them and hear peoples real world experience.