It can be deducted in certain situations. However, it is NOT deductible if used for discrectionary purchases.
For those that use cc for gambling, if you are a gambler by profession, I'm not sure if the interest is deductible. I will ask my accountant that question.
However, I doubt you will remain a professional gambler for long if you are using cc to gamble. The criteria to declare yourself a professional gambler to IRS is very extensive. Very similar to declaring yourself a stock trader. If you have a typical 9-5 job, you probably will not be permitted to declare yourself a professional gambler.
:drink: