How is heroin anyone abused by its users?

Would smoking heroin (as opposed to injecting it) not front to addiction?How is heroin anyone abused by its users?
Abuse of heroin comes in the form of snorting, smoking, and injecting. People who snort or smoke heroin stick to the false belief that snorting or smoking won't lead to addiction. However, more habitually than not, they turn to injection later on when their bodies hold already increased tolerance of heroin.
it is being abused when it is put surrounded by the body !!