Heroin
Mathadone
Marijuana
Hallucinogens
Amphetamines
Inhalants
Narcotics
Each types has its own used to people but in drug abusing each of the types has its own effects to the body, like being energetic, pleasurable, reduces hungerness, being awake, etc. These are the few reasons why many people became drug users or drug addicts but in exchange of the pleasures are the very deadly and curseful effects like the collapsing of the veins, liver and kidney diseases, bacterial infections of the blood and the worst is DEATH.
Drug abusing is very lethal, using it is a matter of risking a person's life, Genuinely speaking, for me drugs are so abundant, abundant that some of it may take a person's life but it is up to the people to use drugs wisely. It is a matter of knowledge, discpline, being optimistic to life, and fighting against drug abuse.