18. the incidences of mouth, esophageal, and liver cancers are higher among alcoholics than those who do not abuse alcohol. true or false? 19. physical, sexual, and emotional abuse are common in alcoholic families. true or false? 20. smokeless tobacco is much safer than cigarettes. true or false? 21. people exposed to secondhand smoke do not face the same risks that smokers face. true or false? 22. many benefits of quitting tobacco use occur almost immediately after quitting. true or false?