Why tobacco use is more common in lower income & less educated households.

I've always wondered why those who have less money to spend on items such as tobacco are the ones that seem to use it the most. Since 1964 it has been reported that smoking has become more evident in populations with lower incomes and fewer years of education, and this statistic gradually increases as time passes. Also, I've noticed that tobacco companies purposefully target lower income groups as well as racial groups by advertising heavily in lower income neighborhoods. Stress is also a major factor in tobacco use. Those with higher incomes can afford to go on stress relieving vacations while those with lower incomes turn to tobacco use as an outlet for their stress. Tobacco use also keeps lower income populations poor. These major companies know that these people are more likely to use and less likely to quit, and that they will keep spending what little money they earn on these products. I also found a statistic about people with fewer years of education do not associate health concerns with tobacco products. Overall, higher income/educated populations are less likely to smoke due to other stress relieving activities and less advertising while lower income/educated populations are purposefully targeted.