Many who argue against the legalization of marijuana suggest that while its consumption may not be very harmful, marijuana indirectly causes significant social harm by acting as a "gateway drug," a drug whose consumption facilitates the use of other, more harmful, drugs. This article presents a theory of "gateway crimes", which, perhaps counterintuitively, implies that there are social gains to decriminalizing offenses that cause minor harms, including marijuana-related offenses.
A typical gateway crime is an act which is punished lightly, but, because it is designated as a crime, being convicted for committing it leads one to be severely stigmatized.
I stopped reading there, because, having been around for a few decades, I understand (as does every other more-or-less rational person) that the notion that being convicted of smoking a joint "leads one to be severely stigmatized" is preposterous. Pot smoking, whether or not one got caught at it, was very widely accepted in my Baby Boomer generation, and is even more widely accepted now. You're more likely to be stigmatized (as a Puritanical nerd) if, by the time you're 25, you haven't smoked a joint.
The stuff that gets put for as "scholarship" in legal academia continues to amaze.