I have no idea what this thread is about, so I'm sure this will be irrelevant. But I'll ramble off-topic for a bit because why not?
People often use the term "altered state" to refer to the effects of using certain drugs. I'd argue for a broader definition and say that pretty much everything we ever purposely do in life is for the sake of achieving an altered state. (A point that Sam Harris has
made.) If we eat ice cream because we expect it to make us happy ... enhanced happiness counts as an alteration. If we give ice cream to our friend because we expect it to make him happy and we derive pleasure from his happiness ... an increase in pleasure is also an alteration.
Doing LSD is obviously different in important ways from eating ice cream. There are more risks. (Nobody ever had a Bad Mint Chocolate Chip Trip, as far as I know.) The upside seems also to be greater.
I'm very inexperienced when it comes to drugs of any sort except for alcohol. The more I read about altered states of consciousness, though, the more I think that doing a hallucinogen like LSD or psilocybin (in a safe, controlled environment) seems like it would probably be a worthwhile experience. There are certain things worth experiencing even if they seem kind of goofy in a lot of ways, and even if they promote irrationality. Having a religious conversion experience is on the list. (I did that in high school.) Falling in love is on the list. (I do that all the time -- I kind of wish I could avoid it more easily.) If you never do either of those things, I think you're missing out on an important aspect of human experience. And having a good psychedelic trip seems like it may belong on the list as well, judging from other people's experiences that I've read about.
I'm just talking about my own personal list. I'm not recommending that anybody else convert to a religion.