2. current daily smoker (eligible smokers will have smoked during the past 30 days and on at least 5 out of the past 7 days; individuals who have made a recent quit attempt, for example, in anticipation of their low dose CT scan for lung cancer screening, will be eligible if during the last 30 days, when they were smoking regularly, they smoked on at least 5 out of 7 days of the week).