The best way to learn proper English is to read news report, and watch news on TV. Watching TV shows is a great way to learn casual English, slang words, understand culture reference and humor. If you have already watched these shows then you may recall the words used in the following dialogs.

...with a slightly out-of-scale head
and a mild Dr. Pepper ADDICTION.
The Big Bang Theory Season 3, Episode 17

Did I tell you our lab got a grant
to study ADDICTION?
The Big Bang Theory Season 4, Episode 20

Oh, yes, online gaming ADDICTION.
The Big Bang Theory Season 2, Episode 3

I'm right in the middle
of my ADDICTION study.
The Big Bang Theory Season 5, Episode 15

...gambling ADDICTION
and sexually-transmitted diseases.
The Big Bang Theory Season 2, Episode 21