How does Tina perceive her past marijuana use now?

Tina perceives her past marijuana use as a regrettable phase because she expresses feelings of guilt and reflection on her actions during that time. This perspective indicates that she views her history with marijuana not just as a past behavior but also acknowledges the negative implications it carried for her mental and emotional health. She is likely understanding it within the context of personal growth, recognizing that while it might have seemed acceptable or even pleasurable at the moment, it ultimately contributed to challenges in her life. This viewpoint emphasizes a sense of maturity and a desire to move forward positively, distancing herself from that aspect of her past that she now sees as unwise or harmful.