Years ago, I tried Zyban (precursor to Chantrix) to quit. It had similar side effects. I quit for 11 months. The only side effects I had were some whacked-out dreams. I'm talking wake-up-with-a-startle-sitting-upright-quick type dreams. For those few seconds after waking, you thought your dream was real. So real that I took my home defensive shotgun from my bedside and put it in the closet.
I told my wife I was having a chemically induced PTSD. I got off the pills. While I stayed off the stinkies for 11 months, one day for NO reason while at a gas station, when the attendant asked, "Anything else ?" I nonchalantly said, "Yeah, gimme a box of Marlboro 100's.". And I was back like I never quit.
Vaping has been a true life changer. Although my psychotic dreams have been replaced with a mild form of OCD..."Do I have enough supplies ?? (count,count,count)" Let's see, it take 3-5 days for delivery, I have....(count,count,count)." LOL