Mark Nelson, an epidemiology and preventive medicine scholar at Monash University in Melbourne, Australia conducted the study.Link Discuss
He found the average life expectancy of those exposed was 70 years, compared to 75 years for those who weren't.
But if you dig deeper, the age difference disappears.
"If you take into account the differences in age and the differences in gender balance, then there was no statistical significant difference between the two groups," Nelson told CBC Radio's As It Happens.
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