Ok, you explain to me why experiencing life shouldn't include the illegal use of drugs, alcohol, or any other substance that will alter your personality. Please note that most drugs don't alter your personality. You alter your personality, and, if someone chooses a drug to do it, what is it to you?
Also, explain what "illegal use" means. Does making something illegal by man's law make the object bad? If it is bad on its own, please explain why.
Then, please explain why a human being should be prohibited by law from eating, taking, drinking or smoking anything he judges to be worthy.