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Strong recommendations are typically based on high-certainty evidence (i.e., high confidence in the estimate of the effect of an intervention) and may recommend in favour of an intervention (when there is high confidence of net benefit) or against an intervention (when there is high confidence of net harm)

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Available from: StatPearls [Internet]

The study also found that the majority of young smokers had taken up the habit before they turned 18 and that the more cigarettes they smoked overall, the higher the risk of respiratory symptoms

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