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 other insomnia inducing effects of smoking include chest conditions such as âsmokerâs coughâ and difficulty in breathing, both of which disrupt sleep, leading to tiredness and an increased need for cigarettes next day â often along with a strong cup of caffeine-laden coffee which doubles the stimulating effect of nicotine.