In Ontario, we have a youth survey of drug use. It has been going on for the last 15 or 20 years, and we're beginning to see the recreational use of opioids come in.
To answer your question about what determines whether people get addicted or not, it's not only availability. There's availability and there's the social norm about the use of it. We know that the drug itself, depending on the type of opioid, will have greater or lesser of what we could call abuse liability. The opioids that come into the system quickly, that can be injected and that leave quickly are the ones people will get into trouble with, because of the abuse liability.
If you want to look at the risk of getting addicted, opioids are less addictive than tobacco and more addictive than marijuana. That's where you would find it on the risk continuum, somewhere in there. Taking a look at prevalence, less than half a per cent of Canadians actually end up with illicit drug use problems, if you look at it compared with other substances. So availability does account for some of it, but it doesn't account for all of it.