Like other members said, I would never include poker in the same category with slots, roulette etc... that's why I say I go to a Poker Club to play and not to a Casino lol
Back on-topic, everything in this World can become a problem if you let it, so I'd say it's mostly about the person... I won't talk much about poker where if you study a lot and play opponents that don't put the same time/energy in improving their game - you'll have a huge advantage and constantly beat this games; I'll mention some Casino games that I've played over the years and because of the CC move to casino.us and the increase in the number of threads about this topic, I've learned that what I did in the past when I've played for example
blackjack and roulette it was gambling as I've made way too many noob mistakes that decreased the chances of me winning, but I've rarely played this games and it was just for fun (still is), what I want to say is that there are beginners strategies and advanced strategies at most of this Casino games and the work/study that people put into this usually gets rewarded...
IMO patience, discipline, study and good bankroll management is what can make you become not just a good poker player, but also a Casino player...