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A gas mask is a type of respirator, but it contains filtration media that stop not only particles but also different gases
Most prospective cohort studies ask participants about their smoking behavior when they first enter the study and assume that this behavior remains fixed throughout the course of the study (Preston et al., 2010b)
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In fact, one study showed that 50% of the casinos sampled had very high air pollution levels despite adequate ventilation measures
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