Don't forget genetic predisposition
towards ADDICTION.
The Big Bang Theory Season 1, Episode 10
Oh, yes, online gaming ADDICTION.
The Big Bang Theory Season 2, Episode 3
I've been doing research on ADDICTION...
The Big Bang Theory Season 1, Episode 10
...gambling ADDICTION
and sexually-transmitted diseases.
The Big Bang Theory Season 2, Episode 21
neurobiology of ADDICTION
in lower animals.
The Big Bang Theory Season 5, Episode 6