She has also hinted at or been shown using drugs.
Lois Griffin
In the most recent episodes, Lois has been known to have more of a cold-hearted personality, such as laughing at people during serious moments, usually towards Brian or Meg.
In the episode And I'm Joyce Kinney, it was revealed that Lois had participated in a pornographic film called "Quest For Fur" to pay for her cocaine addiction which further cemented her being promiscuous.
In the episode And I'm by series creator Seth MacFarlane. In the episode "The Son Also Draws", Lois showed a gambling addiction when the family and lost the family car.
