Social & Preventive Medicine Which one of the following statements about influence of smoking on risk of coronary heart disease (CHD) is not true? A Influence of smoking is independent of the risk factors for CHD B Influence of smoking is only additive to other factors for CHD C Influence of smoking is synergistic to other risk factors for CHD D Influence of smoking is directly related to number of cigarettes smoke per day 💡 Explanation Which one of the following statements about influence of smoking on risk of coronary heart disease (CHD) is not true? ✓ Correct Answer: B. Influence of smoking is only additive to other factors for CHD