The broad answer is that the government's view is that Parliament has enacted valid legislation regarding tobacco. Tobacco use is a unique social and health problem, and the Tobacco Act was developed specifically to try to manage that problem. In addition, the Tobacco Act has been subjected to constitutional challenges and we know as a result of the Supreme Court decision in 2007 that it is validly enacted legislation. So there is a firm basis for management of tobacco in the context of the Tobacco Act and no need to address it in the Canada Consumer Product Safety Act.
On October 19th, 2010. See this statement in context.