Your Spending
It might take the form in shopping, gambling, an addiction to eBay, etc, but using your money is how you blow off steam. Instead of letting out your emotions, you spend them. Material objects, however, can never replace abstract things so try to keep your wallet in your pocket-- your head and bank account will thank you.
http://quiz.myyearbook.com/myspace/AlcoholDrugsVices/358845/Whats_Your_Vice.html