Gambling is not wrong, however if gambling becomes an addiction and hurts you or the people around you, it is wrong.
I think it is completely wrong because after starting slowly most of them will be addicted to this and will loose money in the end. So just avoid it if possible.
True, but if you can manage keeping yourself in check and not play for a profit and only for fun, and only play once in a while, gambling not wrong However, if you know you cannot be controlled, stay away from gambling.
That's the hard part though, a lot of people have trouble once they get started. It's a slippery slope, and it's one that I'd rather people not try to walk on.