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.
If you are experiencing sleep problems then there may be other factors causing this such as stress, work patterns (e.g. shifts), caffeine and snoring. The underlying cause of your sleeplessness needs to be investigated further but if you smoke then this is definitely a cause. One way of treating your sleep problems is to stop smoking. This can be a difficult thing to do and the subsequent cravings as a result of nicotine withdrawal do affect sleep. But these are temporary only and so disappear after a few weeks so stick with it.