Catholic moral theology has nothing to do with the problem, the problem is that recreational use of MJ is a leg spreader for girls a certain indicator that they are promiscuous. You can stick your head in the ground but I lived it. All the girls that smoked MJ "partied". There is no project (whatever that means), it is a fact. If you choose to not believe it that is your problem. I do not write just for you, I right for all the parents that don't know what I know. Ladislaus has complained that I am too detailed about my past and he is right, so I am refraining from saying more. My father knew nothing about these things that started in the in the 1960's with sex and drugs, I'm sure there are parents out there that are the same. THAT is why I write and shout from the roof tops.
The term "leg spreader" is kind of scandalizing, just saying.
That aside, I essentially agree with you, with the caveat that we cannot also generalize recreational use as inherently directed towards hedonism and abuse. Mark has provided solid evidence to the contrary, and others have shown that morally-speaking you have just as much of a risk of MJ abuse amongst some dispositions as you would alcohol or tobacco.
We all have different backgrounds, especially those of us who came from the world to Catholicism. I've seen it, I'm sure just about everyone here has too in their personal lives. The problem here is why you feel the need to "shout it from the rooftops" so often on CI, where many are already well aware of the dangers of the modern world? Your audience, and scope, is limited to Catholics who are like-minded in that matter.
So, I see it as a futile exercise that serves to reveal your own morbid fixation on the subject of licentiousness and the possibility of a hidden (or explicit) pride on your part to condescend your virtue to others (as evidenced by both yours and Meg's replies in these threads).