Vice or the end

I have been trying to quit smoking for about 2 or 3 months.  I was mentally in a very good spot to be successful.  Unfortunately my wife was getting stressed.  As I started to quit...she was begging for a smoke.  This made it very difficult for me.  I'm weak.  Even though my body was getting the nicotine it needed to not have a cigarette, I still had the urge for the habit.  Every time my wife asked for one, I had one.  I was poisoning myself with nicotine.  This was causing me (I think) to be emotionally unstable.  I really think it was one of the causes.  This Saturday the unstableness came to a head.  My wife and I started arguing.  She had been pushing my buttons all afternoon.  By dinner time I got pissed and was being an asshole.  Not being able to take it anymore I almost slit my wrists in front of her at the dinner table.  I almost couldn't stop myself.  I felt like I was on auto pilot, watching myself, but unable to stop.  My wife luckily talked me down and took the knife.  We decided I was no longer stable enough to quit smoking at this moment in time.  That I should try again in a month or two.  Just need to get stable again.