This is just likened to alcohol, If your brain doesn't carry it, you quit for your own good. Gambling is to be done in moderation and in any case you find out that you're not acting along the principles you set for yourself repeatedly, the best is to quit, and not just quit out rightly. Quitting from any addiction is a gradual process, its more like a replacement of addiction, you can replace your gambling addiction with possibly, reading, music or other profitable ventures so you can live a sane and happier life. do not just start avoiding the gambling sites, If you try it, you might get worse when you retreat back. the best way is to gently channel that gambling energy to the new hobby and gradually you will quit your bad and destructive addiction and welcome a profitable one.