The Pathway. 1  Air enters the nostrils. 2  passes through the nasopharynx, 3  the oral pharynx.  through the 1  glottis. into the trachea.  into the right and left bronchi, which branches and rebranches 1  into. bronchioles, each of which terminates in a cluster  of. alveoli.
As the body adjusts to less caffeine, these symptoms should subside. Nicotine May Cause Less Sleep. Nicotine is also a stimulant, and nicotine side effects can cause insomnia and withdrawal symptoms similar to caffeine. Smoking may also create other sleep disturbances.
Following are the most common withdrawal symptoms of Nicotine: 1  Smoker feels anxieties. 2  Tingling in the hands and feet. 3  Sweating. 4  Intestinal disorders like cramps, nausea, headache. 5  Cold symptoms including sore throats, coughing, and other signs of colds and respiratory problem.