Data is also available at the Canadian Centre on Substance Abuse web site:
http://www.ccsa.ca/

Also, take a look at the following Statistics Canada reports:

The gambling industry: Raising the stakes, 1992 to 1997:
http://www.statcan.ca/Daily/English/981209/d981209.htm
 

Gambling: An Update
http://www.statcan.ca/Daily/English/020718/d020718e.htm

For detailed data on household expenditures on Gambling see:
http://www.gdsourcing.ca/CMEinfo.htm