The best sleeping position for your posture is

a. on your back with your hands folded on your chest

b. on your stomach with your head facing the right/hand side of the bed

c. on your left side only to promote adequate blood flow to the heart

d. on your side with your hips and knees slightly bent

On your back. laying on your back helps relax your body

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.