I've been a smoker for 7 to 8 years. I had tried to stop a few times but never really managed to hold it for long until I watch this video :
https://www.youtube.com/watch?v=G74vJ2etQYk
It's one hour long, sure, you might think "oh it's bullshit, I don't have time, besides I already know everything that's said in there, I'm not dumb". Well you're right, you might know all these things, but actually watching it is still vastly different. You definitely should set aside one hour of your time and watch it all, trust me, it's 100% worth it.
Now to specifically answer your question : not especially mind blowing but beating an addiction will most likely make you understand yourself and your habits much better. With time you'll notice other addictions and other things binding you that you wouldn't have noticed otherwise.
If that's not already the case I would recommend starting meditation.
Good luck.