All of this is exacerbated over time.
When you quit, those cilia and other functions start to come back. This creates “work” and “energy” in the lungs. That’s why you may feel pain, discomfort or heaviness in the chest and lungs, when quitting. It’s also why you are tired.
It can last a little while … BUT you are HEALING.
So, if you are feeling exhausted, drained or just plain tired AND your schedule allows for it, nap or take an extra hour to sleep in. It’s great for your body, for your stress levels and for your success, as you cannot cave into cravings and smoke, if you are asleep ;-)