Materials you take to alter your state of mind. Humans have always liked to do this in every culture. Tapestry that was produced by people in south western us, the picture is similar to a characteristic of consuming payo. Mind-altering substances are also associated with pretty much every religion. They will use these types of substances in various rituals. Insole acetate used in religious ceremonies as a mild hallucinogen. Some rural areas, people will smell cow manewer to get high. You put a plastic bag over the poop and smell it and you can get a high. No they are illegal because they can produce bad behaviours. It"s not necessarily the side effects that the government is worried about: health. Intoxication and addiction are the not ideal effects, which the government does not want you to have. They do not want people coming into their jobs and not performing to their best.