Heroin is an illegal Schedule I drug, meaning it is in the group of the most highly addictive drugs.
Any method of heroin use-snorting, smoking, swallowing, or injection- can cause immediate harm and lead to addiction.
Heroin enters the brain quickly, slowing down the way the user thinks, reaction time, and memory. This effects the way the user acts and makes decisions.
It is highly addicting because it effects the part of the brain responsible for dependence. Some users are addicted after one or two tries.
Heroin is one of the most frequently reported drugs by medical examiners in drug abuse deaths.