If you do n't get enough sleep , your body constantly produces adrenaline and stress hormones to keep you awake . Heart disease is the No . 1 killer of Americans . It kills more people than any other cause, and it's a leading risk factor for heart attacks in young adults. Smoking is one of the leading causes of heart disease in young people .
Heart disease is the No . 1 killer of Americans . It kills more people than any other cause, and it's a leading risk factor for heart attacks in young adults. Smoking is one of the leading causes of heart disease in young people .