The gradient effect was much less pronounced among the lower-income classifications, although individuals in the middle (those with annual incomes between 200 and 299 percent of the poverty level) income category were less likely to be current smokers than those in the poor and near-poor categories
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Yuki D, Takeshige Y, Nakaya K, Futamura Y (2018) Assessment of the exposure to harmful and potentially harmful constituents in healthy Japanese smokers using a novel tobacco vapor product compared with conventional cigarettes and smoking abstinence
6.1 Operating environment for FCV tobacco sector in India Currently, the FCV tobacco sector in India is confronted with a whirlpool of differing and contradictory concerns