They can cause you to mix up your speech, lose control of your muscles, make meaningless movements, and do aggressive or violent things. Inhalants can cause sudden death. Inhalants can kill you instantly. Inhalant users can die by suffocation, choking on their vomit, or having a heart attack. Know the law.
Hallucinogens are illegal to buy, sell, or possess.
Get the facts. Hallucinogenic drugs distort your perception of reality. Hallucinogens cause your sense of space and time to become distorted and cause you to see objects that aren't really there. It's easy to quickly develop a tolerance to hallucinogens so that it takes more and more of the drug each time to get the same effect. This is dangerous because taking more and more of the same drug may lead to an overdose with severe effects.