Not really a predjuice against, more like common sense. We have tolerated people poisioning us in public for too many years from cigars and cigaretts, just because the drug is still leagal because of historical purposes doesn't mean one should still use it. I'm sure I'll offend a few with that statement but really think about it for a minute, what is the difference between the legal drugs like nicotine and the illeage like marijuana other than the paper that says one is legal?
From a survival perspective, I've seen so many people suffer the health probvlems that come from both. What if you did need to bug out on foot and after the first mile are wheezing because your lungs are too full to breathe?