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Former smokers were defined as individuals who used to smoke and quitted at least 1 year prior to their recruitment.
Note that relapse refers to turning from abstinence to smoking, thus analysis of relapse must confine to information of participants who ever quitted at some time point(s).
Similar(58)
Quit at the top, they say.
You can quit at any time".
"I quit at 55," Mr. Livingstone said.
I can still quit at the last moment.
Cabinet Office minister and key Brown ally to quit at reshuffle.
Mr. Sessions tried to quit at least twice.
Still, quitting at the right time is difficult.
"Who quits at anything after that length of time?
I have never quit at anything in my life.
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