I agree; It's very irritating when people blame their addictions (and other things around them) for how things turn out. As Jack said, they're weak-minded.
It's so easy to just blame anything and everything for problems, and not take any responsibility. But, at the end of the day, the fault is their own because they had the choice to say 'no'.
But, hey, they're not hurting anyone but themselves in the end, ne?
-"There's a hole in the world like a great black pit/And it's filled with people that are filled with sh*t/And all the vermin of the world inhabit it/But not for long..." - Sweeney Todd.