It's addictive probably because of the thought that you can make easy money. When you lose, you think you can chase your losses, and be back in the green again, though it never happens (pretty much). It's also based on greed.
Yes we can become addicted because gambling was caused by our obsession to benefit a lot. If we gamble we will pursue profit much so that win or lose we will continue to pursue benefit and hope to get a lot of advantages.