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.
Nicotine withdrawal symptoms. Nicotine affect many parts of your body, including your brain. Over time, your body and brain get used to the prescence of nicotine and when you stop smoking, you go through withdrawal. So withdrawal is simply the time that it takes for your body to adjust to not having nicotine.