Participants who reported being lifetime
nonsmokers or ex-smokers at baseline and who
responded negatively at follow-up to the question,
“Since your last interview in (MO/YR),
did you smoke at least 100 cigarettes?” were
identified as nonsmokers and ex-smokers, respectively.
Participants who reported being
current smokers at the baseline interview but
denied having smoked 100 or more cigarettes
during the follow-up period were also identified
as ex-smokers.
NESARC investigators ascertained mental
disorders with the Alcohol Use Disorder and
Associated Disabilities Interview Schedule---
Diagnostic and Statistical Manual of Mental
Disorders, Fourth Edition version administered
at baseline and follow-up. Participants
who did not meet the criteria for a lifetime
disorder at baseline but met the diagnostic
criteria in the period between the baseline and
follow-up interviews were rated as new-onset or
incident cases.32 We included 8 disorders in
our analyses: major depressive episodes, dysthymia,
manic episodes, generalized anxiety
disorder, panic disorder, social anxiety disorder,
specific phobias, and posttraumatic stress
disorder (PTSD). PTSD was assessed only in
the wave 2 interview. However, participants
were asked whether the time they first experienced
the symptoms was since the baseline
interview. Only PTSD episodes that started
after the baseline interview were categorized as
new-onset PTSD.