I wouldn't say I really had much of an addiction. If I had to say, it would probably be the smell of gasoline at the gas station. Now, this isn't something that I have to smell all the time, because I'm not actually addicted, but when at the gas station, and I catch a whiff of the scent, I like to breathe it in because I find the smell a bit, well, addicting? :x However, like said, it isn't something that I desperately need to smell every time like a real addiction might be; I just like the smell.
On another note, I don't believe the question for this thread is suitable for Other Chat. It's more of a one-answer type question that would fit better in OVP.