NO IT IS NEVER TOO LATE to reap benefits of stopping smoking. Sure, the longer you smoke, the more likely you are to get the diseases that smoking causes. Lung cancer, for example, is directly dose-related. Doctors figure it in "pack years", e.g. 2 packs a day for 10 years is 20 "pack years", 1 pack a day for 30 years is 30 pack years, etc.
And, remember, everyone who smoked doesn't necessarily get lung cancer. But those who never smoked rarely get it. And those who stopped smoking greatly reduce their likelihood of developing it. And those who smoked and continue to smoke are at greatly increased risk of developing it. Lung cancer is more efficient in some ways than emphysema. Lung cancer kills you rather quickly; emphysema makes you wish you were dead.
Also please note that the risk of developing other smoking-related diseases such as heart disease goes down almost immediately when you quit smoking. So there are immediate benefits that start within minutes after quitting, and it just gets better and better, the longer you refrain from smoking.
Best of luck with your quit.
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