Yeah, I think there's personalities who are more prone to addiction than others.
I'm more of an "all or nothing" kind of guy myself, and have been addicted to tons of things. Sometimes it can be beneficial though. For example, falling in love -- I can provide a huge amount of love to the right person, due to my addictive personality. Work -- helps make for a healthy bank account, and allows me to learn nearly anything I need to. Then obviously, there's the bad parts, such as addiction to alcohol.