Miguel has been unable to sleep for the past one week. his wife gives him a vitamin pill and tells him that it will him sleep at night. the next morning, miguel is thrilled because he has slept better than ever before. in this scenario, miguel’s response to the vitamin can be attributed to

Reinforcing stimulus in the Psychology is the answer. Miguel believed that the pill which his wife gave him was a sleep-inducing pill and this enabled his brain to believe that he will have a good sleep tonight. This led to relaxing of Miguel's mind and body, and thus, his better sleep. 

If it's a smaller child or infant, place one on the middle of the chest and on the child's back. (if it is a bigger child with enough room for two, place one on the upper right/your left of the chest, and one on the lower left/your right) the pads should never touch each other. 

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.