N refers to the number of entire population
However, we must do more Despite the progress, it is estimated that each year, 660,000 people in the United States are diagnosed with a tobacco-related cancer, and that 343,000 people die from these diseases
There are tens of thousands of tobacco retailers
Various environmental (exposure to tobacco adverts), social (tobacco use by peers or family), genetic (genes associated with dopaminergic neurotransmitter system, cellular transport system or serotonergic neurotransmitter system, among others) and psychological factors were previously related to smoking and smoking addiction [4,5,6,7,8]