A U. S. study shows that second-hand smoke is more harmful to non-smokers than the smokers themselves. While smokers damage their cardiovascular system, the system can self-regulate in order to offset some of the consequences of smoking without smoking The body of a person cannot adapt to changes after smoke inhalation, so the impact of passive smoking on non-smokers is far greater than that on smokers. Which of the following, if true, can support the above conclusions? ['More than 85% of lung cancer patients are caused by smoking, and 30% of the total cancer deaths are caused by smoking.', 'Smokers and non-smokers are married, the latter is 30% more likely to die of heart disease than the former.', 'Passive smoking is the third most preventable cause of death after active smoking and alcohol-related diseases.', '0-year-old smokers who smoke four packs a day, their spouse may die of lung cancer.']