Gambling is so addicting because when people have won one time then they think that luck is always going to be with them and they play further and more.
When you have tasted a win wit gambling then you are going to want more and more.
I don't think a winning could make people addicted, the only thing could make people addicted to gambling is a fun way to double your money with less effort if you compare it to real work that require hard work and muscle.