I think addiction starts after you win, even if it's just once, that's when you start gambling recklessly and you also start betting higher.
Most basically, gambling addictions is instigated through the excitement of winning but in a general term, it is basically an inability to control ones emotion's at either winning winning or loosing
It is difficult to control one's emotions in gambling, when a gambler wins some money, he thinks why not gamble with more money. Because of this thinking, he bets relatively more money on the next gamble and if he loses on the second gamble, then it is not right for him to gamble with that much money. When a gambler gains by gambling, he becomes more addicted to gambling and when a gambler loses money by gambling, he decides to gamble again to recover that money. That is, whether a gambler gains or loses, he has a target to gamble. There are very few gamblers who can control their emotions and gamble, but those who can control their emotions do not make many wrong decisions in gambling.