No matter how you get it into your system, heroin gets to the brain quickly. It’s easy to become addicted. Even after using it just one or two times, it can be hard to stop yourself from using again.
You can smoke or snort it, but most users inject it into their veins to get the quickest high. That’s the most dangerous way to take it. You can overdose more easily, and you can be infected by dirty needles.