To be honest, if your simply offering your personal opinion and not following any generally accepted medical guidelines, like the CDC’s or the AMA’s (and I tend to agree with you in your assessments, BTW), then I don’t see what relevance your medical training is in telling people what is a drug and what isn’t. I don’t intend to disrespect your credentials, I just don’t see how they apply in this case.
I also agree that the Catechism isn’t necessarily condoning tobacco, nor alcohol for that matter.
So I don’t find the Catechism paragraph at all helpful in this case, and I say that as someone who always goes to the Catechism first despite it often not being relevant to my tradition. What’s more,
the Latin bishops of my state took a neutral stance on the marijuana law despite being willing to take
an open stance against gay marriage, so the relevant local Church officials did not find the law worthy of remark one way or another.
Marijuana is at most as destructive as alcohol physically, though in my understanding it is actually less so; therefore marijuana can’t be prohibited on the basis of physical damage since alcohol is not considered physically damaging enough to be inherently morally evil.
Marijuana is at most as psychoactive as alcohol, though dosages are hard to quantify on the black-market. Used in moderate amounts marijuana does not impair the use of reason any more than alcohol; therefore marijuana can’t be prohibited on the basis of psychotropic properties, though excess is obviously forbidden on the same grounds as alcohol.
I do not support its use, though I don’t consider it inherently morally wrong, but I have taken a strong stance regarding its prohibition based on careful consideration of the teachings and traditions of the Church, especially my favorite theologian St. Thomas Aquinas.
Peace and God bless!