Good question @lordneroo :)
Let's see if I can reply to it in a clear, concise manner.
There are two important chemicals involved in addictive behaviours (or behaviours with addictive aspects): dopamine and opioids. While the former plays a fundamental part in the "wanting/craving" aspect of it (the pursuit and seeking of the behaviour), the former has its role in the "liking" phase (the one that yields pleasure).
So, yes! The reward system (the mesolimbocortical pathways) plays a role here alongside endogenous opioids systems :)
Thank you for taking some of your time to understand this psychological condition and for looking at it with kindness and empathy.
I wish you a wonderful day my dear. You are a sweetheart! :*