Figure 1. Cigarette smoking age of onset

From

Prevalence of Cigarette Smoking among Medical Iraqi Students

Fady S. Yasso, Saba S. Yaso, Petra S. Yasso, Isam V. Dafdony

American Journal of Public Health Research. 2014, 2(1), 10-15 doi:10.12691/ajphr-2-1-3