While in theory it is, most (if not all) people start using these things without knowing the risks and harms of these substances. So, I also support "deny by d

While in theory it is, most (if not all) people start using these things without knowing the risks and harms of these substances. So, I also support "deny by default" policies for addictive substances. The problem is "deny by default" has a side effect of creating unregulated black markets. So it's a really hard problem, at least from my perspective. I don't think about the downvote. The comment might be considered as shallow, or some people might really want the freedom, I don't know, and frankly, I don't care.