Cate driving high?

Rewatching teen mom and just finished S6:E2. At one point Cate is driving and she covers up the camera on her dashboard with a sticky note, we can hear her coughing, she takes the paper down and then smoke is coming out of her mouth and nose.

She gets home and is later on a call with Dr.Drew, they’re talking about her depression. He asks if she’s smoking pot and she goes “oh yeah! Like twice a day”