Both Canadian Student Tobacco, Alcohol and Drugs Survey (CSTADS)/Youth Smoking Survey (YSS) and Canadian Tobacco Alcohol, and Drugs Survey (CTADS)/Canadian Tobacco Use Monitoring Survey (CTUMS) data were used for the youth analysis: CSTADS/YSS data were used for youth in grades 7-9, who were approximately aged 12-14, and CTADS/CTUMS was used for youth aged 15-19. Earlier waves of the CSTADS/YSS included students in grade 6 (CSTADS 2014-15 and earlier) or grades 5 and 6 (YSS 2006-07 and earlier); neither of these grades are included in this report, for purposes of comparability between survey waves. The more recent waves of the CSTADS/YSS (from 2006-07 onward) also included students in grades 10-12, but these students were not included in the analysis due to their overlap in age with the CTADS/CTUMS sample; CTADS/CTUMS was selected as the data source for older youth since the sampling frame includes youth both in and out of school, whereas the CSTADS/YSS only samples youth who are attending school.
CSTADS/YSS and CTADS/CTUMS data have been integrated where possible. However, differences in the questions asked on each survey and the timing of the surveys does not allow for parallel reporting of all measures. The most recent wave was 2017 for CTADS, and 2016-17 for CSTADS. The CSTADS/YSS runs on school years (data collection between September and June), while CTADS/CTUMS runs on calendar years (data collection from February to December). Data collected via the CSTADS/YSS (grades 7-9) are presented by grade rather than age, as the survey was school-based and sampling was done by grade. CTADS/CTUMS is not school-based; data are presented by age.
The CSTADS/YSS and CTADS/CTUMS base their definition of a current smoker on different items: the CSTADS/YSS defines a current smoker as having smoked at least 100 cigarettes in his/her lifetime and smoked in the 30 days preceding the survey; CTADS/CTUMS defines a current smoker using their response to the question "At the present time do you smoke cigarettes every day, occasionally, or not at all?”.