When injected, heroin takes effect immediately and creates a huge surge of euphoria. People smoking or snorting heroin may not have this rush as sharply or as instantly.
The skin of the user will flush, and they will get a dry mouth. They will feel like they are fading in and out of being awake. Their pupils will constrict, and the person may begin to “nod off."
Heroin causes a slowdown in breathing, which is how heron overdoses kill people.
When people are on heroin and awake, they may have partial memory loss, a lack of coherency, and a loss of self-control. Decision-making will be compromised, and they may appear sleepy.
Heroin users are also likely to be constipated while using, and finding laxatives can be a giveaway that someone is using. Heroin users can also have skin conditions and infections. Needle sites can be a clear sign someone is injecting something a substance that may be heroin.
Users may opt to wear long-sleeve clothing to hide scars, infections, or marks on injection sites.
Track marks are often found on the inside of the elbow, the back of the hand, the wrist, behind the knees, or between the toes. If someone has been using for a long time, they may have collapsed veins and opt to inject into the thigh or buttock.
Heroin can cause abortions, so health problems like a miscarriage could be a sign of heroin use, as are blood infections, abscesses in the skin, or exposure to infectious diseases like hepatitis C or AIDS.