chew (one's) own tobacco
To focus on one's own life, rather than someone else's; to mind one's own business. Why are you worried about what other people are doing? Just chew your own tobacco.
chew one's own tobacco
Rur. to mind one's own business. Sally: You seem awfully happy all of a sudden. How come? Tom: Chew your own tobacco. I'm just sitting here chewing my own tobacco, not bothering anybody.