Stimulant
What they are.
Hallucinogen
One way it harmful is that it can make you see thing that are not there.
Second way is it can increase you heart rate.
ex muchrooms
Narcotics
Cause numbness and drowsiness
advil
Inhalants
Bloody nose, and feeling of being drunk.
ex markers
Stimulants
speeds up your CNS and sweating more
ex is caffeine
Depressants
Two ways is confusion and fatigue
ex is alcohol