CTADS/CTUMS was conducted by Statistics Canada with the cooperation and support of Health Canada. CTUMS (1999-2012) was developed to provide Health Canada and its partners with timely, reliable, and continual data on tobacco use and related issues. From 2013 to 2017, content covering alcohol and drug use (prescription and non-prescription) was added to CTUMS to create the Canadian Tobacco, Alcohol and Drugs Survey (CTADS). CTADS/CTUMS used a repeated cross-sectional survey design. Data were collected from February to December (annually for CTUMS; biennially for CTADS), using computer-assisted random-digit-dialed telephone interviews.

The samples for CTADS/CTUMS were selected using a two-phase stratified random sampling procedure. The two-phase design was used in order to increase the representation in the sample of respondents belonging to the 15 to 19 and 20 to 24 age groups, which are populations that are most at risk of becoming smokers. In the first phase, households were selected using random-digit-dialing. In the second phase, one or two individuals (or none) were selected based on household composition. This ensured the representation of individuals in the younger age groups because the random selection was implemented such that at least one person in the 15 to 19 or 20 to 24 age groups would be selected within a household, if they existed. The samples included the population of Canada aged 15 years and over, excluding residents of Yukon, Northwest Territories and Nunavut, as well as full-time residents of institutions and individuals without telephones (or with cell phones only, prior to 2015). Each year from 1999 to 2010, CTUMS released two semi-annual files and a yearly summary; this report uses the yearly summary data sets, except where noted. In 2011 and 2012, only annual files were released. CTADS released data sets every two years, from 2013 to 2017.

CTADS documentation available at http://www23.statcan.gc.ca/imdb/p2SV.pl?Function=getSurvey&SDDS=4440

CTADS and CTUMS datasets and documentation available at https://www23.statcan.gc.ca/imdb/p2SV.pl?Function=getInstanceList&Id=333871