There is a Health Canada regulation that obliges manufacturers to report all the ingredients contained in their cigarettes. Naturally, smugglers and illegal operations do not respect this obligation. There are not many tests done, but in general, cigarettes, whether they are legal or not, taxed or not, kill. They cause tobacco-related diseases, but it cannot really be said that they are more dangerous than cigarettes that are taxed. There is a common perception that, because it is aboriginal, it's more natural, and thus less harmful, but that is not true.
On May 12th, 2008. See this statement in context.