> RTFM is an initialism for the expression "read the fucking manual".
> RTFA ("read the fucking/featured article"—common on news forums such as Fark.com[6] and Slashdot, where using "TFA" instead of "the article" has become a meme)
I don't know of any studies looking specifically at smoking vs non-smoking, but its been highly speculated to be a strong risk factor. Apparently, there is a big gap in prevalence of smoking between men and women in China (close 50% for men, closer to 5% for women), which is thought to be at least partially an explanation for the differences in deaths (2/3rds of deaths were male, 1/3 were female).
"Low prevalence of smokers, and no allergic diseases despite of drug hypersensitivity and urticaria was self-reported by any patients, indicating that allergic diseases and smoking history may not be the susceptible factors for COVID-19."
"Together, this study indicates that smokers especially former smokers may be more susceptible to 2019-nCov and have infection paths different with non-smokers."
Mentioned in TFA.