Mental Health Problems and Initiation of E-cigarette and Combustible Cigarette Use

aDepartments of Mental Health and

bDivision of Child and Adolescent Psychiatry, School of Medicine, Johns Hopkins University, Baltimore, Maryland; and

aDepartments of Mental Health and

aDepartments of Mental Health and

aDepartments of Mental Health and

cDepartment of Psychiatry and Behavioral Sciences, School of Medicine, Duke University, Durham, North Carolina

aDepartments of Mental Health and

aDepartments of Mental Health and

dWelch Center for Prevention, Epidemiology, and Clinical Research and

eEpidemiology, Bloomberg School of Public Health and