They definitely improve their health, and since they won't cause anybody to commit passive smoking I suppose they'd improve the health of those around them.
If they have emphysema or bronchitis already, quitting will reduce the effect it has on them (emphysema is a disease of the alveoli, bronchitis of the bronchae). The carbon monoxide in the smoke also would no longer bind with hemoglobin in their blood to form carboxyhemoglobin, wasting oxygen that could be used for respiration, so they get more tired easily etc.
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Explanation:
Running or eating fruits and vegtables
Because, when someone has a heart attack it is due to a blood colt went up into their heart so in order to relieve it you have to thin the blood so if there are more they wont break off as well and go down to the heart while the person is having the heart attack because it will cause them to die. A stroke however, is when blood supply to the brain is interrupted or reduced. It deprives the brain of oxygen and nutrients, which can cause the brain cells to die.
