The assertion that research suggests that pursuit of happiness is associated with serious mental health problems, such as depression and bipolar disorder implies that pursuing happiness causes these disorders, but I would hope researchers would look into causality. I would posit that people with depression or bipolar disorder are more likely to pursue happiness, as they feel this is what they lack, which would lead to this association, not the other way around.
ORIGINAL COMMENT
The assertion that research suggests that pursuit of happiness is associated with serious mental health problems, such as depression and bipolar disorder implies that pursuing happiness causes these disorders, but I would hope researchers would look into causality. I would posit that people with depression or bipolar disorder are more likely to pursue happiness, as they feel this is what they lack, which would lead to this association, not the other way around.