Nicotine is only one of the many toxic chemicals
inhaled while smoking. What effect can such
toxic chemicals have on the body?
(1) They stimulate an increase in height.
(2) They stimulate uncontrolled cell division.
(3) They eliminate carbon dioxide from cells.
(4) They eliminate chromosomes from many cells.

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PhyCS
(2) They stimulate uncontrolled cell division is your answer. This causes cancer, specifically for lungs, lung cancer.