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This is a statistical compendium on "Health Characteristic and Cigarette Smoking Habits" concerning 123,000 adults. It was noted that heart conditions (excluding rheumatic heart disease) among male smokers whose heaviest level of smoking exceeded two packs a day had a prevalence rate about 70% higher than the rate for "never smokers." Figures are given for arteriosclerotic heart disease, hypertension without heart involvement, peptic ulcer, and bronchitis or emphysema or both; they represent an objective indictment of heavy cigarette smoking. Also "persons who ever smoked had more disability days than those who had never smoked, and heavy smokers had more disability days than light smokers."
Cigarette Smoking and Health Characteristics: United States, July 1964-June 1965.. Arch Intern Med. 1968;121(1):112. doi:10.1001/archinte.1968.03640010114034