You sure addicting isn't a word? Dictionary.com says it is plus spell checkers don't pick it up.
Well, turns out I was wrong about it not being a word
However, my search turned up something about this (and it's crazy how relevant it was, haha):
Addicting
...is not an adjective! You can only say "The cocaine is addicting me." You cannot say "Cocaine is addicting." Cocaine is addicting what? AddictIVE is an adjective. "Cocaine is addictive." addictinggames.com is probably a misuse of the word, unless they're saying that the games are addicting people.
http://www.stanford.edu/~grantp/grammar.htmlI think most people use it incorrectly, which is why the word bothers me so much. Who would ever say "the cocaine is addicting me"
But, I was wrong, it is a word!