Q1: I am a current or former smoker.
Q2: I still smoke or quit smoking less than 15 years ago.
Q3: I am 50-80 years of age.
Q4: I have or had a 20 pack-year history of smoking.
(A pack-year is the number of packs of cigarettes smoked per day by the number of years the person has smoked. For example, 20 pack year is equal to smoking 1 pack per day for 20 years.)