As long as he is not driving and is not acting out with other people, the addictive drinker or drug user is only hurting his own liver and brain cells.
That’s true, when a drunk is not driving and killing and maiming people, and abusing his wife and children and losing his job he is not harming anyone but himself.
And when the drug addict is not stealing and killing to support his habit, he’s hurting no one but himself.