i knew a girl one time who would not smoke pot. it wasnt that it was illegal. it wasnt that smoking is unhealthy. or that is cost too much. it wasnt even the stigma attached to it or that she had to P-test for work. it was because it made her introspective and she couldnt stand herself. she told me this - she did not like the person she was so she chose not to look.
for a lot of people, they have been sick for so long they dont know what healthy is and when they get a taste of it the unfamiliarity is disturbing to them. the warning for monotomic elements is that you better have your internal work done because it merely enhances who and what you are. if you are evil, youll be more evil. if youre good, youll be more good. or patient or hateful or kind or generous or greedy OR DEPRESSED or anything else that is a part of YOU.
my jury is still out and leaning in favor of it, with strong cautions as above.