no one is above the habit of becoming an addict. If you are a gambler and you understand the simple notion of losing too much or trying to win when it isn't coming then I can guess you can be able to refrain yourself from becoming a gambling addict. Professional or no professional gambling is still gambling and you can become addicted to it even if you have been playing for lots of years, in some way the gambling addict are actually the ones who find it really difficult to leave gambling.
Does it exist a term like professional gambler? I don't think so. Maybe professional beter and knowing what you play. But when it comes to casinos games it's all to luck. If you can explain me what is pro gambler?
A professional gambler is someone who takes and carries gambling as a profession and is a full-time gambler. Of course, you can call them professional bettors since what they basically do is use different methods to get wins and avoid losses as much as they can. Their betting patterns and bankroll management skills are too good.
That being said, even a professional gambler has to face losses and no matter how much experience they've got or how many patterns and methods they use, they will still have days where they won't get anything at all because they are so unlucky.