Which practice is the single most important method to break the spread of infection?

a. covering your mouth when coughing

b. using sanitizing in place of soap and water

c. washing hands

d. wearing gloves

Only ten amendments were ratified by the states.

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.