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Along with nicotine, cigarette smokers receive tars, phenols, hydrocarbons, arsenic, and many other chemicals. All of the following are affect of inhaling tobacco except
(a)narrowing or hardening of blood vessels in the heart and brain
(b)stomach ulcers, due to an increased acidity in the stomach
(c)a higher frequency of respiratory infection (e.g., colds, pneumonia)
(d)stimulation of the central nervous system; including increased alertness

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Important Questions on Human Health and Disease
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Assertion : Myaesthenia gravis is an autoimmune disease.
Reason : Immune system rejects the transplant muscles.

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