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Although it remains to be seen to what extent the effects observed are related to the duration of smoking, in our previous work we have shown that at least the lower fatigue resistance in smokers was not related to the duration of smoking or smoking pack years 19

AQI is based on the levels of five major pollutants regulated by the EPA: ground-level ozone, particulate matter (PM2.5), carbon monoxide, sulfur dioxide, and nitrogen dioxide

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Moreover, further research is needed to expand the knowledge about disposable e-cigarettes, usage patterns, and health-related risks

doi:10.1136/bmj.316.7144.1563