Here is up to date data from South Korea, which due to their mass testing that other countries will hopefully follow with is gives the most accurate picture of the disease.
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*the line that says 19-Oct should say 10-19 and was formatted by excel as a date.
The picture presented by this data is that COVID-19 is essentially a non issue for people under 50. It becomes a small issue between 50 and 59 and becomes significant over 70. Interesting (which mirrors China but at a lower rate) is the fatality rate among males being over twice as high as among females. Caveat that the people under 50 can spread it to people in the high risk groups.
Looking for smoking rates, I found that "In 2016, the cigarette smoking prevalence was 40.7% among male adults and 6.4% among female adults." To actually draw a conclusion that the fatality rate is related to smoking, we'd have to see data (which I haven't seen) that was actually broken down by
smokers vs. non-smokers. However, it is a reasonable theory that smoking significantly increases the risk of dying from COVID-19. It may be indirect in that the smoking has led to other medical conditions which are the direct cause of the rate increase.