I am doctor Thomas, a double board certified US doctor, and I will give you an exact answer here.
Life expectancy is much higher than 50% over the next 5 years, based on your description.
Please see the following definitive study article.
I will quote the conclusion
"As we have seen, COPD is associated with increased mortality and, thus, with reduced life expectancy. Those with stage 1 or 2 COPD lose at most a few years of life expectancy at age 65 compared with persons with no lung disease, in addition to any years lost due to smoking. But current smokers with stage 3 or 4 COPD lose about six years of life expectancy, in addition to the almost four years lost due to smoking."
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