does having one cigarette ruin quitting The Benefits After Just Month Of Cigarettes – SMOKO E- Cigarettes + Vapes Tobacco smoking - Wikipedia

In the end, remember that recovery takes time, and even after quitting smoking, it may take months to see full improvement

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This appears to remain a reasonable estimate.[xix] To substantiate this claim, the English report cites Nutt's article as well as an article by Polosa, who in turn states that ENDS are less risky but only cites Nutt's article

A prospective cohort study has shown that individuals who stop smoking experience a significant decrease in stroke incidence compared to those who continue