I think people can be "addicted" to a brand, a series of games, a director, a writer and such, yes.
I'm "addicted" to Tim Burton, I want to see all his movies, no mater how crappy it might be.
But then again if a movie of him really sucked, I will never watch it again, but I will see his next movie.
I'm also "addicted" to the diablo, starcraft and warhammer 40k series, not that I need to have the collector's edition of them all, but I "need" to have every game of the series, I should replace my broken diablo cd's but thats easier said then done.
I think we took the term addiction a little broad indeed.
So yeah lets talk about temporarily addicted and addicted.
I've had a lot of temporarily addictions mostly with games and books.
Getting a new book and needing to read it in one sitting no matter what, eating while reading, going way past bed time, or not even going to sleep at all (thats why I bought all my books in vacation time).
Same with a new game, needing to play it for hours and hours on end.
For the moment I do have an addiction, the addiction beeing my incredible wife, which I'll be married to for 6 months in 5 days (cute? no?).
I'm also addicted to air, food and sleep and a few other things I need to do to survive.
I haven't gotten real addicted to anything so far though, I doubt I will ever get addicted to anything. I know its easier said then done, but I beleive that I'm not really a kind of person to get addicted to something.