I guess a lot of things could be associated with gambling, it is deciding where to draw the line that becomes the cut off point so to speak. "Keep your lives free from the love of money" is what Paul tells us in Hebews and also in Timothy. Proverbs states "Dishonest money dwindles away, but whoever gathers money little by little makes it grow" which could very much be related to gambling as could this verse in Ecclesiastes "Whoever loves money never has enough; whoever loves wealth is never satisfied with their income. This too is meaningless." So I think it is safe to say that there are enough hints there in the bible that warn off gambling.