After getting into an argument, Jena tries to find ways to escape from all the negative thoughts that would bring her down.
Though Jena is not addicted to drugs but she starts thinking about smoking marijuana because she thinks it would make her feel better about what happened.
When something happens, you react and your brain tries to find a reason to justify your reaction even if it was not a wise thing to do. Same is the Jena's case here which indicates that it was an emotional trigger for her.
