If I quit gambling because of losing the money and the loss is not too much, I am a smart bettor because if someone can not minimize their losses effectively, he may lose too much money. He must stop gambling instead recover his losses because that can make him losses more money. Losing some money will be okay but if the losses become big and we also lose control, that will not be okay. We will not become smart bettors because we don't know what will happen next and that will add more losses.
I read a comment on this board where a member once said that gambling without expecting or experiencing losses is like going for swimming and expecting yourself not to be wet by the water. Even smart gamblers still can not evade losing but would reduce how much they lose by only spending a small amount they can afford to lose. Every gamblers should know that being smart does not mean that they can not lose but means that they should gamble responsibly.