I might sound quite judgmental (and maybe a bit awful) but I can't think of another way to phrase it: but unless you have a history of substance abuse that only makes sense if you have a very strong fear of not being able to control yourself if you try that substance and become instantly addicted to it (which isn't at all rational).

Most people are perfectly capable of consuming alcohol/weed in moderation without doing any major harm to people surrounding them or themselves.