Today, smoking is a widespread habit. About 43 percent of the adult men and 31 percent of the adult women in the United States smoke cigarettes regularly. It is encouraging to note, however, that millions of people have given up smoking. 75 percent of the male population and 46 percent of the female population have smoked cigarettes at some time during their lives, but 26 percent of these men and 11 percent of the women have stopped smoking. The number of persons who have given up smoking is increasing. Income, education and occupation all play a part in determining a person's smoking habits. City people smoke more than people living on farms. Well-educated men with high incomes are less likely to smoke cigarettes than men with fewer years of schooling and lower incomes. Among teenagers, the picture is similar. There are fewer teenaged smokers from upper-income, well-educated families, and fewer from families living in farm areas. Children tend to start smoking if one or both of their parents smoke.