the number of cigarettes smoked per day was positively associated with the risk of fatal coronary heart disease ( relative risk = 5.5 for greater than or equal to 25 cigarettes per day ) , nonfatal myocardial infarction ( relative risk = 5.8 ) , and angina pectoris ( relative risk = 2.6 ) .
C0018787
heart
C0027051
myocardial infarction