Internet addiction

"Why in the hell do you keep buying liquor?" 
"Because I'm an alcoholic."

I really think you're problem drinkers!

Somebody asked why people get ［become］ addicted to alcohol and drugs.
ある人が人々が酒や薬の依存症になる理由を尋ねてきた。

be diagnosed as alcohol dependent
アルコール依存症と診断される

Internet addiction
インターネット依存症

computer addict
computer dependency
コンピューター依存症

He is alcohol-dependent.
He's an alcoholic.