Gambling is the same as do drugs, if you've been using for sure you will always use and it can not be avoided before you feel the negative things from it.
Yup! drugs isn't addictive the first thing you try it even smoking and drinking alcohol but if you done it very repetitively then you will surely be addicted to it in no time and I must say just like gambling if you will still on doing it then there will be a certain level of addiction to the extend that you will never comeback!