While the others smoke weed and talk more, Amber takes the time to think about her personal values.
Would I rather smoke weed and break a promise to gain friends...
Identify Your values
...or possibly lose my chance to get friends by keeping my morals?
She decides that it isn't worth the risks, and declines the offer.
Decide and Act
No thanks, I'll pass.
Amber is glad that she didn't smoke pot. Although Molly and Jake may not think she is cool anymore, Allie and Todd still do. She didn't break her morals, and didn't have to give up her chance to make new friends.
Evaluate the Decision
It's a good thing I didn't smoke. Smoking will temporarily impair your judgement and reaction time!