Considering
the smoking factor in conjunction with RADS, Hassan
et al. verified slow recoveries in 6 patients with dyspnea
while investigating the severity of airway obstruction and
clinical features of 18 patients acutely exposed to chlorine
gas, and explained it to be associated with their smoking
and lung disease histories [33]. Both hospitalized patients
in our study were smokers. Although smoking may be assumed
to have influenced their clinical course, we did not
conduct relevant analyses; further research may be needed
to address this issue.