In movies and TV you see heroin users insert a needle, pull blood out, and then inject. 1. Is that how people really do it, and 2 why do they mix blood first?

Question

In movies and TV you see heroin users insert a needle, pull blood out, and then inject. 1. Is that how people really do it, and 2 why do they mix blood first?

In: Biology

Answer 1

They pull out blood to make sure they caught a vein, and letting the blood and heroin mix together is supposed to improve the high.