What helped me to quit (been good for over a year now):
Tabulate what you spend on them a month, week, whatever and put it in a bank account at each respective time interval (month, week, you get it) and make it a bank account that you can't touch.
It gives you a pretty nice little fund for something cool after a while, and it removes your means to buy the shit anyways (provided, that is, that you live on an inflexible income).
It may seem like sort of namby pamby advice, but it's helped both myself and a friend to quit.
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