What are the two (2) large veins that deliver blood into the right atrium???

Superior vena cava (SVC) and inferior vena cava (IVC),

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. 

The most common stereotypes could be that boys don't cryboys don't get emotional boys are never as mature as girlsboys are lazyetc.