The NY Times asked this question a couple of days ago. In light of some of the other "highs" they compare trading to, I'd have to say no, trading is not addictive.
Simply put, if given the choice, I'd much rather be stoned and having sex than trading.
Meanwhile, our brains are not "hard wired for making money." That had to be one of the dumbest, and most depressing things I've read about humans in awhile. Our culture is hard wired to obsess about money and glorify money and it tries with all of its might to make us follow along.