I would say that most of them begin before the age of 18, but at the age of 18 to 24 they are already addicted to it. That's why we have a great proportion at these ages. We still want to set the age at 21, and maybe 25, because the damage done to the brain will be permanent, and it's more than we think. We think it's a recreational drug, but this recreational drug may damage the brain for the rest of their lives. We thus have to protect them. It's why we are so focused on this issue.
Maybe Jeff had some other...?