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It connects areas of your brain that have never connected before. Maybe your geometric recognition connects with your creativity and you become aware of realities that you once never knew. As a great psychonaut once said; "Acid opens up doors, but once they're open, you can't close them".
Because it's illegal just about everywhere, there is some risk to doing so
If someone's never taken a psychedelic I'd recommend psilocybin "magic mushrooms" over LSD. It's more natural and usually a more pleasant, shorter experience.
A lot of people don't like to use drugs in general.
Hallucinogens are still a big mystery to science. Just from the fear of the unknown they shouldn't be recommended on the scale you're suggesting.
There are recorded cases of them causing irreversible changes in healthy adults.
Before doing so you should invest time in learning about LSD (or any other drug you want to try) so you know what to expect and can handle the comedown.
How much do you know about me specifically? How do you know that I am over the legal age for taking drugs, and if taking marijuana is legal in my state?
it has been known to have side effects and leave you more psychologically unnerved then before.
(Hallucinogen Persisting Perception Disorder)
Some people prefer sobriety, maintaining full control of themselves.