Street heroin comes in a variety of forms. Most commonly on the west coast, it is sold on the street as a dusty brown to dark brown powder (if it is cut with lactose such as powdered milk)or sticky black substance known as black-tar heroin (which may be really hard to break)
Back in the day, the mexican cartels used cheap poor things to manufacture and cut it with, and now, we more commonly see more purer versions of it, as manufacturing procceses become better.
While using Black tar (or heroin in general)a sudden surge of intense pleasure known among heroin users as "the rush." the skin flushes and the arms and legs feel heavy. Dry mouth is common, and the heroin user may also experience nausea, vomiting or intense itchiness.
Once the rush ends, heroin abusers are drowsy for several hours. Users refer to this period of time as "Nodding out." Mental functioning is slow and disoriented. Heart function and breathing slows.
heroin is “cut” with other drugs or with substances such as sugar, starch, powdered milk, or quinine. Street heroin can also be cut with strychnine, fentanyl or other poisons. Because heroin abusers do not know the actual strength of the drug or its true contents, they are at risk of overdose or death