Anyone stopped smoking?

Like I said before, people want to think about other evils like environmental pollution (automotive, industrial, chemically based fixtures and fitting), cholesterol, food additives, crops and livestock and associated pesticides/growth hormones etc, stress levels, work-life balance, lack of exercise, alcohol abuse, blah blah blah.

This sort of comment dumbfounds me.
Yes, there are plenty of things around that can shorten our lives to various degrees and which we have varying degrees of control over.
But to even suggest those sorts of factors can have any comparison with the shear magnitude of harm caused by smoking just sounds crazy to me.
Somebody please show me the medical studies which prove any of these factors will reduce a user's life by anything like an average of 10 years or be anything like 50% likely to be the direct contributor to a person's death as smoking will. And that's not to mention the 'less serious' potential side-effects like bad skin, bad smell, lack of smell/taste, impotence, financial cost, reduced general fitness and such like. (OK, maybe serious alcohol abuse or obesity could be up there)
So my request: Smokers, I'm all for free will, personal responsibility and your right to do what you wish with your body, but at least be honest and realistic about why you do it and the potential for harm when justifying your choice to other people.
Then I can take you seriously. But when I see arguments like that I assume the person is either completely ignorant or in denial.