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.
The symptoms of nicotine withdrawal can begin within 30 minutes of your last use of tobacco. Symptoms will depend on your level of addiction. Factors such as how long you used tobacco and how much tobacco you use on a daily basis will impact the severity of your symptoms. Symptoms of nicotine withdrawal include: intense cravings for nicotine.