I'm not so sure that this speaks to their character as much as it speaks volumes about their intelligence. You are attending a conference where the NBA is going to warn you about all the things you should not do like having guns, associating with the wrong people, putting yourself in dangerous situations, spending all your money, women who might attempt to trap you, drugs, alcohol, performance enhancing drugs, and so on. Then the first thing you decide to do is to check in and do a couple of the things that you have already been told the conference is all about.
Pretty stupid.
All in all, it will become a short suspension, they will catch crap in the locker room for being dumb enough to be caught and by Christmas it will be just a rookie story that will be told from time to time for laughs. No big deal. My guess is that at least half the league probably partakes of a puff once in a while.