Measuring economic costs weighs the expense of both vaccination and illness against the net present value of the future earnings of someone who would otherwise die from the disease.

ECONOMIST: Influenza vaccination

Simply put, ART saves the lives of those who would otherwise die from AIDS-related illness.

WHITEHOUSE: Fact Sheet: HIV/AIDS Treatment

Half of all long-term smokers will die from tobacco-related illness, which causes 100, 000 deaths a year.

BBC: '570 children a day' start smoking

We know that the majority of people who die by suicide have an underlying and often undiagnosed mental illness such as depression or bipolar disorder.

CNN: Why more Americans are dying of suicide