According to CDC, past smoker is: (A) Person who had smoked >100 cigarettes previously and is not smoking currently, (B) Person who has smoked >10 cigarettes previously and is not smoking currently, (C) Person who has smoked >100 cigarettes previously and  reduces to 10 cigarettes per day, (D) Person who has smoked > 100 cigarettes in his or her lifetime, who smokes now, but does not smoke every day
Answer is A. None