Being a smoker has been a standard part of your medical history for a long time now for obvious reasons. There's no reason to think there is a coordinated strategy for lying about smoking in the context of a pandemic (much less revising patient medical histories, which would be the medical service industry lying).
50%+ lying about smoking in the face of potential (or actual) respiratory failure is laughable.
I don't know where you got 50%+. The outpatient group was 5.3% current smokers vs expected (adjusted for age and sex) 26.9%. For inpatient it was 4.4% vs expected 17.9%. The fact that both groups had the same reported rate of current smokers (within experimental error) but very different expected rates says to me that you're only getting the people who are honest or simply incapable of quitting even while sick.
Also, see this concern brought up:
> Finally, and I believe this to be the most significant piece of data supporting the null hypothesis, the prevalence of never-smokers in the general population is approximately 0.75, if one subtracts the smoking incidence rate from 100. In your patient groups, non-smokers are strongly under-represented by about a factor of 2 relative to the general population, with 31% of outpatient and 32% of inpatient being labeled as never-smokers. This suggests to me that any amount of smoking actually puts one at risk for contracting COVID-19 as defined by this paper.
In any case, many other studies of COVID-19 have found similar results, and studies of different respiratory diseases have not. I'd initially just thought people were lying too, but at some point the evidence becomes overwhelming--if the protective behavior were anything but smoking, then people would have accepted it long ago.
Of course smoking is far deadlier on average than the coronavirus, per my calculation elsewhere in this thread. No one should start smoking because of this, but I do see enough evidence e.g. that a nursing home patient (who's at very high risk of death from coronavirus, and likely to die of something else before smoking-related diseases could develop) shouldn't quit. Vaping probably gets any benefit with almost none of the health risk, though that's speculative.
1. http://beh.santepubliquefrance.fr/beh/2019/15/pdf/2019_15_1....