Yep. Discipline is always the key to be success in everything. Those gamblers who can be disciplined and always stick with the plans, they will be safe from the possible problems such as addiction, being stressed, and etc. But no doubt that it won't be easy to be disciplined because sometimes there should be tough challenges.
It is the hardest thing to achieve but believe me, it is possible , I was Able to achieve it and the best of all is that the same strategy can be applied to trading, trading sometimes requires a lot of control in what you operate, then when you fully master it, it is another level unlocked.