Vaping, addiction need to break free

So I'm thinking about my vaping habbit. I think I vape alot, but probably not alot compared to the hobbiest. I sleep vape during the night. I'm just curious with an addictive personality how is this habit affecting my dopamine levels. I'm basically on 4 days no pmo so that's probably why I feel so down but could my nicotine addiction be making me unhappy to? Any info is appreciated.