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.
Although you may have cravings to smoke weeks or even months after quitting, as more time goes by, these urges will diminish in strength and frequency. Nicotine withdrawal symptoms are more short-lived, and should only last a few days (or a couple weeks) at most.or most people, the first week of quitting is the most difficult time. This is a time when getting over both the psychological dependency on cigarettes and physical effects of nicotine withdrawal can feel overwhelming. You might feel anxious, depressed, impatient, tired, or even hostile.