Pill poses danger to older heavy smokers.
D000367:Age Factors; D003267:Contraception; D003276:Contraceptives, Oral; D003710:Demography; D004194:Disease; D005193:Family Planning Services; D006331:Heart Diseases; D011153:Population; D011154:Population Characteristics
D003276:Contraceptives, Oral
Age Factors; Contraception; Contraceptive Methods--side effects; Demographic Factors; Diseases; Family Planning; Heart Diseases; Oral Contraceptives--side effects; Population; Population Characteristics