People have the agency to not consume drugs. The point is, marketing is completely absurd, it's an immense inefficiency of the system.
What someone thinks of marketing & advertising will almost always tell you what they think of the intelligence of the typical person. Once you realize that, you realize it's merely a bias that someone is arguing from, that they think most everybody else is a moron and should be deprived of their individual liberty (for their own safety).
A slaughterhouse for example is very efficient at processing animals from living beings into mass produced meat, however you want to feel about the ethics of that.
and you're still missing the point. I'm not saying that marketing has no effect on people (on the contrary, that's the problem, and it affects me too). my point is about the absurdity of basing our social organization on this. marketing only has perverse motivations, then you see the effects on people. tobacco is the classic example. this is an inefficiency of the system.