No kidding... This probably means that Cannabis causes infertity by some means other than lowering sperm count. Imagine the statistic: gang members admitted to the hospital were 40 percent less likely than non gang members to be diagnosed with heart disease. That's probably not because they eat a healthy diet and exercise. It's probably because the rest of the population is less likely to be diagnosed with a gunshot wound.
You have missed the point. Nothing in the study mentions a higher rate of reported cannabis use than in the general population. The record scratch is due to implying generalisations based only on a non-typical population of infertile couples without any control.
