How can behavioral science be applied in improving public health

Behavioral science is the study of human behaviors and how they can be influenced.  by examining patterns in behavior as well as reactions, individuals with behavioral problems can be more adequately treated, resulting in greater mental health of our society/the public.

Idk the answer either bro my boi sparks

I'd say replacing that habit (of smoking) with a more healthy habit, like going to the gym. c;