I'm not sure what's you're point. For me the bad thing is that drug addiction is increasing. OD is just a proxy for that, since it's something easier to count t

I'm not sure what's you're point. For me the bad thing is that drug addiction is increasing. OD is just a proxy for that, since it's something easier to count that the number of addicts. (b) seems legit to me. If you OD on legal use that means that the drug wasn't give out responsibly or in a safe environment. c) an increasing trend in drug consumption is not something I find reassuring even if it may have a legit explanation like an increase in the number of cancer (because that's also scary) (a) is a more sensible topic but an increase in voluntary OD isn't a sign of an healthy society.