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Covey says

Tiredness associated with smoking may be due to the effects of nicotine addiction, reduced oxygen in the bloodstream, or difficulty breathing

The new smoking product is for two very specific groups of people

Sixth, propensity scorematched sensitivity analyses complemented the conventional regression approach by balancing observed covariates across exposure groups, providing a more robust assessment of whether the observed associations are likely to reflect genuine effects or residual confounding

From Australia to England, governments are moving toward banning the single-use products, citing underage use and environmental impact