I'm skeptical that it is sound to just throw out smokers and make a claim about coffee health benefits.
By taking people that use a lot of one common addictive substance (caffeine) and none of another (nicotine) they might just be selecting people with low potential for addiction/high will power. I believe those kinds of people might have lower mortality rates for reasons other than coffee consumption.
By taking people that use a lot of one common addictive substance (caffeine) and none of another (nicotine) they might just be selecting people with low potential for addiction/high will power. I believe those kinds of people might have lower mortality rates for reasons other than coffee consumption.