But, you're always the one doing it. You do the action, and you took a substance. Your choice, your responsibility. The actions of taking a substance comes with impressibility. It increases irresponsible behavior, and that makes one culpable for putting others in harm when not taking that responsibility seriously. Don't drive if you want to get wasted. If people did things voluntarily with concern for others, then there wouldn't be a need for government. When people lack self-control, other beg for an authority to impose external control on those who lack it.