Figure 2. Percentage of smokers for different daily number of cigarettes

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