I stopped smoking and starting using a vape pen but i feel pain in my lungs is that where they are clearing up? is that normal? ?

Most people: Do not feel good when they stop smoking. You will get better eventually. E cigarrettes are safer.

Possibly: The area of pain may be from where cilia are mobilizing materials from your lungs. However, E- cigarettes may cause cough, irritation of throat/ mouth, nausea or headache. REF: https://www.bmj.com/content/360/bmj.j5543. As of 11 SEP 2019 The Centers for Disease Control and Prevention reported 6 deaths & > 450 possible cases of severe lung injury in 33 states & 1 jurisdiction related to vaping.