Diabetics must monitor their diet and exercise regularly, and they might also need to receive daily insulin shots.

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The answer to this is true, diabetics do need to watch what they eat, as well as exercise on a regular basis. They also have to have insulin shots. 

They probably don't understand either 1. what the nightmare is about or 2. his anxiety and stress

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.