This paper aims at assessing and exploring socioeconomic inequalities in tobacco use in Kenya. Using the theory of fundamental causes, and concentration index, we investigate the determinants of tobacco use, and whether it disproportionately affects the poor. All data used in this study emanated from the 2014 Global Adult Tobacco Survey implemented in Kenya on a nationally representative sample of men and women aged 15 years and older. Our results suggest a link between tobacco use and socioeconomic inequality. Overall, poorer households are more affected by tobacco use than richer households. This socioeconomic inequality is more evident among men and households living in urban areas. The decomposition of the concentration index indicates that the overall socioeconomic inequality for current tobacco smokers is explained by 69.11% of household wealth. To reduce the prevalence rate of smoking in Kenya, policymakers could design and implement tobacco control programs through the equity lens. Community health workers could be used to promote non-smoking behaviors among the poor.