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Higher pack years typically mean more permanent damage, but quitting at any point still provides significant health benefits and prevents further deterioration

Within How long does it take for the tar to get out of your lungs

6 months after quitting: improved mucus clearance and less shortness of breath Around the six-month mark, your lungs have made major strides in recovery

However, fewer does not mean none , and vaping carries its own set of risks

It was published in Chest in 2007 and the brilliance of this trial was that they were assessing the outcomes of a smoking cessation intervention, rather than whether they actually quit or not