Yes as libertarian who was offended by the idea of regulating what adults can put in their bodies at home, I have changed my mind after seeing real world consequences. As a young college student its easy to believe some kind of naive model of humans as basically well-intentioned or rational or at least a blank slate. Experience tells me that most illegal drug (and heavy alcohol) use has negative externalities and tends to harm the character of the user over time. An assertion younger me would have probably found offensively moralistic (what is “character” anyway?) but here we are.