Initiation of Electronic Cigarette Use by Age Among Youth in the U.S.

E-cigarette smoking is initiated as young as age 7 years. Different from conventional cigarette smoking with peak initiation risk at age 14-15 years, the likelihood of initiating e-cigarette smoking continues to increase up to age 18 years. The unique age pattern and significant gender and racial/ethnic differences provide useful data to support further research to strengthen tobacco use prevention in the U.S.