Well, it's OK that you used 99.9999 percent and not the word "all", because personally, I believe that it is very possible for a gambler to leave gambling and never try gambling again, ever, if he or she hits it big and manages to build a good business with the money.
At least, for a fact, I trust myself that, if luck locates me and I win up to a hundred thousand dollars from gambling tomorrow, I may never gamble again to be honest, except for whatever reason, I mismanaged the money, which is not possible at all, or that for whatever reason, my business isn't going well, which also Is not possible.
Overall, any gambler who is not addicted to gambling does have the potential and capability to quit gambling and never gamble again, but then, the need for more and more money will be the only reason why the gambler will keep coming back and back, over and over again.
I see things in the same way, while I do gamble from time to time if I am lucky enough to get a massive win you can be sure that despite my feelings of gratitude towards gambling due to such a happy occurrence, I will make sure to not gamble again, since I know very well that one of the most common mistakes gamblers make is to let greed control them, and they keep gambling hoping to get even more money from the casinos and lose it all during that process.
Well for me, I may not take a total exit from gambling if I make a big win or hit a jackpot but I may likely take a short break from active gambling and for that, I may take a month or two to enjoy my winning and also limits my loses at all time, because by continues playing, you may end in more loses at some point, then also greed may set in at some point in the process of being actively playing while you already made a winning.
Sometimes, what leads gamblers to lose more than they win is their inability to defeat their greed tendency and also chase a particular direction thinking that the result will repeat itself.