How should we define light or intermittent smoking? Does it matter?

What terms are used to describe LITS in the literature, and how has each term been defi ned?Multiple terms are used in the literature to describe light or intermittent smokers, but these terms are not defi ned consistently ( Tables 1 and2 ).Defi nitions were often different for studies among adolescent smokers than for those with adult smokers, but this difference in the populations studied does not explain range of defi nitions noted.Light smoking has the widest set of defi nitions, ranging from " denied ever smoking regularly and denied any smoking within the past 30 days " to smoking 1 -39 cigarettes per week to smoking 10 -20 cigarettes per day (CPD) (