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Future studies might consider more comprehensive measures of social disadvantage in order to better capture differences in stress and smoking related to socioeconomic status

Pod system products, which are simpler to use than open systems, are still in the early stages of market promotion and are not yet popular

These smoking cessation outcomes were similar across levels of motivation to quit, minutes until first cigarette of the day, and drug use days (during the prior 6 months) upon study entry

One suggestion was that the profits of multinationals should be taxed globally so they cannot exploit national differences in revenue collection