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Objective To examine the impact of a 50% increase in market prices of cigarettes on health, poverty, and financial protection. Design Compartmental model study. Setting 13 middle income countries, totalling two billion men. Participants 500 million male smokers. Main outcome measures Life years gained, averted treatment costs, number of men avoiding catastrophic healthcare expenditures and poverty, and additional tax revenue by income group. Results A 50% increase in cigarette prices would lead to about 450 million years of life gained across the 13 countries from smoking cessation, with half of these in China. Across all countries, men in the bottom income group (poorest 20% of the population) would gain 6.7 times more life years than men in the top income group (richest 20% of the population; 155 v 23 million). The average life years gained from cessation for each smoker in the bottom income group was …