YSS

Current smoker: has smoked at least 100 cigarettes in his/her lifetime; includes daily and non-daily smokers.

• Current daily smoker: a current smoker who has smoked at least one cigarette per day for each of the 30 days preceding the survey.
• Current non-daily smoker: a current smoker who has smoked at least one cigarette during the past 30 days, but has not smoked every day.

Former smoker: smoked at least 100 cigarettes in his/her lifetime and has not smoked at all during the past 30 days.

Experimental smoker (beginner): has smoked at least one whole cigarette and has smoked in the last 30 days.

Former experimental smoker (past experimenter): has smoked at least one whole cigarette and has not smoked at all in the past 30 days.

Puffer: someone who has just tried a few puffs of a cigarette, but has never smoked a whole cigarette.

Ever tried a cigarette: someone who has ever tried a cigarette, even a few puffs.

Never tried a cigarette: someone who has never tried a cigarette, not even a few puffs.

Smoking prevalence: the estimated number of smokers in a specified group, divided by the total population of that group, expressed as a percentage.

Cigarette consumption: the average number of cigarettes smoked per day by daily smokers.