That depends on what you mean by "mind-altering." Reading a book might be "mind altering" depending on what the book says - and there are some people who would like to be able to ban such books. Alcohol isn't exactly "mind-altering" in the usual sense, but people enjoy it. (And, it used to be banned but isn't any more.) Is bungee jumping "mind-altering"? How about dreaming?
Please define exactly what you mean by mind-altering, and we can take it from there. But, be careful! Things like watching TV or having sex causes brain waves to become measurably different from its ordinary, waking patterns - so be sure you don't mean "changes brain wave patterns" in your definition, unless you would ban TV and sex as well.