I feel like Narcissism is the diagnosis of the day. I hear people throwing this word around everywhere. People with addictions certainly demonstrate narcissistic behavior (a lot!), but in all my years of treating people with addictions, I've rarely run into true Narcissistic Personality Disorder.
These two issues can definitely overlap and have several similarities...The big difference is that one of these has a good chance of getting better and one doesn't. Watch this video, so you'll know the difference.