In the past, have you ever made a serious attempt to quit smoking That is, have you stopped smoking for at least one day or longer because you were trying to quit:Find:Pt:^Patient:Ord:PLCO
in the past, have you ever made a serious attempt to quit smoking that is, have you stopped smoking for at least one day or longer because you were trying to quit:find:pt:^patient:ord:plco
Quit smoking attempt PLCO
quit smoking attempt plco