[vhlhvjcov]

Why not?

People can be functional heroin addicts (same as functional alcoholics).

Not that it’s a good or desirable thing.

Most heroin overdoses come from cut drugs, or from using at similar level after a break, often caused by prison stints. Both direct consequences of them being illegal.

[WeylandYutani]

How many functional heroin addicts are there? Even rock stars either eventually kick the habit or die in a hotel room.