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Ontario Student Drug Use Survey

"The Ontario Student Drug Use Survey (OSDUS) is a population-based
survey of Ontario students in grades 7 to 12. The OSDUS began in 1977
and is the longest ongoing school survey in Canada. This
self-administered, anonymous survey is conducted across the province
every two years with the purpose of identifying epidemiological trends
in student drug use, mental health (e.g., depression), physical
activity, and risky behaviour (e.g., violence, gambling), as well as
identifying risk factors. Typically, the OSDUS surveys about 6,000
students in over 100 elementary and secondary schools across Ontario.
The 2005 survey will be the 15th cycle of the study." [from]

On the website, you can download the 2005 OSDUS Questionnaire, 
2005 OSDUS Drug Use Report, and the  2003 OSDUS Mental Health and
Well-Being Report.