You'd think that the makers of this study would try to control for unhealthy lifestyles.
I would be interested in knowing how bored teatotalling non-smokers compare with teatotalling non-smokers who have "exciting" lives.
Regards,
Maybe people who complain about boring jobs complain about everything in their lives and are pessimists. I have no patience with people who complain of boredom; the word was banned in my house when my children were growing up.