Scientists have learned a great deal from studying and using stem cells. which diseases/disorders are not involved in stem cell research?
a)
cancer
b)
diabetes
c)
bird flu
d)
spinal cord injuries

Imma gonna say go with the very first answer (:

Smoking damages the respiratory system by inhalation of a foreign substance, that is absorbed and residue is left behind on our lungs sponge like substance. the gas that is inhaled also increase your blood pressure and dilates your blood vessels. also the process of inhaling and exhaling the smoke it causes irritation to the throat and mouth. smoking can cause lung cancer and other respiratory and circulatory diseases.