How long does the smoking related risk remain once you quit smoking?

How long does the smoking related risk remain once you quit smoking?

Persistence of smoking related risk: The coronary risk comes down by fifty percent one year after smoking cessation. The risk for developing coronary artery disease approaches that of non smokers three to five years after smoking cessation. But the risk for developing chronic obstructive airways disease and bronchogenic carcinoma may persist for even a decade after smoking cessation.