Schizophrenia and smoking have shown a strong association in studies worldwide.

They showed a statistically significant association in a large case-control study.

The study shows an association but is not designed to show cause and effect.

This argument continues, although the preponderance of evidence shows a positive association between social capital and the internet.

"Our study shows an extremely strong association, a dose-response relationship," he says.

The researchers believe they have shown an association between low cholesterol and colon cancer.

Also, this kind of trial just shows an association, not true cause and effect.

A more recent paper showed an association of A*0101 with lower than average responses to measles vaccine.

One report also shows an association with celiac disease, but again, this has not shown been beyond that.

Studies across 20 countries show a strong association between schizophrenia and smoking.