a) the most pro weed ad I've ever seen
b) said whenever you want someone to focus on the positive aspects of their existence and reject the negative aspects of said existence.
Inhale the good shit, exhale the bs can be applied to being only around positive people and staying away from toxic people and their bs
Used to define or describe the quality of somthing, usually drugs or a situation of some sort.
Steve handed mike a fat bag of chronic and said "good shit, good shit mike."