Pure heroin is not sold directly to addicts. These substances end up in the user's bloodstream and can cause physical or mental problems, even death. No matter how heroin is taken, addiction can develop quickly. Addiction can occur in a matter of days or weeks, depending on the potency of the drug, how much is used and how often it is taken. Most people who experiment with heroin wind up addicted, including more than 500,000 Americans.
Injection is the fastest way to become addicted.
The initial effects of heroin can give the user a pleasant feeling. With continued use, however, a physical tolerance develops, and the effects become more severe . Some of the more common symptoms of heroin addiction include these. Disturbed sleep patterns. Impaired mental functions.