I think that's a really important point.
I understand what Dr. Savard's point was in illustrating that the predominance of coronary disease was extremely high in that population. Stats, damn lies--we've all heard it about statistics, but when you evaluate a statistic like that, you must control for the presence of illicit substance use.
Cocaine and methamphetamine are associated. There are no old methamphetamine addicts. It's a very devastating drug. People don't have years and years of meth use. There are old cocaine addicts. Cocaine plus alcohol makes cocaethylene, which is many times more productive of coronary atherosclerosis than even cocaine alone, which is enormously associated with cardiac disease. That's the confounding that I'm talking about in data.