If you want quit addiction from something then you may need to change your life style and concentrate on long term pleasure like building your career or doing workouts and getting success in your business like that.
I agree with this but before doing it, its better if you consult to a psychiatrist first because he/she can give you tips and advice unto how you can remove your addiction. Change your lifestyle, find companions that are not like you who are gambling. Try to focus on one goal like make a business or get a decent job or travel around the world or do blogging. Anything that is not related to gambling.