It makes you wonder how accurate the smoking cancer stats are. IF everyone smoked, presumably this means a lot of people who are not recorded in the stats despite smoking or former smokers, lowering the mortality rate or risk factor, although obvious smoking is still bad.
I would expect it to be the other way around.
If nearly everyone smoked, then even nonsmokers were constantly getting a fair amount of secondhand smoke.
This would raise the background rate of cancer, making it appear that smoking raises your risk by less than it actually does.
About 1/2 of all people who ever died from smoking-related causes were non-smokers.