There's certainly some evidence that cigarette smoking by youth can be a gateway to other substances. You learn how to smoke cigarettes; you learn how to smoke other things.
There have been repeated reports, for some years, that the distribution channels for people involved in transporting contraband tobacco is that they may bring contraband tobacco into Canada, but when they go back to the United States they may bring drugs. Within Canada there are distribution systems, and on reserves, where there's this tremendous combination of illegal activity for multiple products.