prevalence in the United States in those with college
education and above was 40% and 13%, whereas in those
with less than high school education, it was 36% and 35%,
respectively (31,32). In LMICs, similar changing patterns
of smoking prevalence by socioeconomic status have been
reported (33-35). Some ethnic groups have higher smoking
prevalence in part because they are disproportionately
represented in lower socioeconomic groups (36,37). Similar
to patterns of smoking, mortality rates within a country are
usually higher among lower socioeconomic groups.