Not Just Any Houseplant

I remember when I lived in the college town San Luis Obispo CA and always had to share apartments with college students even though I wasn't in college at the time. I didn't have a car and my bicycle got stolen, so my roommate offered me a lift downtown because she was moving some of her furnishings elsewhere. So I get in the car with her houseplants in the back and we are driving down Santa Rosa Blvd. when I realize people are honking and pointing and laughing at us. Then I realized her houseplant was a pot plant. And my thought was I'm the type of person that never smoked pot in her life and now I'm going to go to jail for possession. Egads!. Luckily my stop was near and I got out before anything else happened.

What was she thinking?