claim: smoking prevalence is highest in symptomatic patients admitted for covid-19.
evidence_1: the very low prevalence of smokers in our covid-19 cohort seemingly replicates the findings that can be extracted from descriptive tables in chinese reports and also in the recent us reports from new york city.", "21 patients (5%) were active smokers and 44 (10%) were ex-smokers, while 376 (85%) were non-smokers.", "the current study is useful since it suggests that smokers may carry some type of protective mechanism from symptomatic sars-cov-2 infection, although this should definitely be confirmed in specifically-designed, controlled studies.", 
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  "active smokers were only 21, this number corresponding to less than 5% prevalence of active smokers, which is disproportionately low compared with the 24% prevalence of smokers in the general italian population (p<0.001).")