Since I have continued dipping without her knowing, now I have to quit without her knowing. So no support from her this time.
Hey man - I actually disagree totally with this position. 100 days ago my life was very much like yours. I was a ninja dipper - wife didn't know, or so I thought. I would dip on the throne at night, dip in the shower, to and from work, cutting the grass or working the in yard, etc. I dipped and lied, lied and dipped. You know the story. Let me tell you a couple things: first - the wife always knows, whether you think so or not. Mine knew what I was doing. MAybe she didn't know the extent of the addiction, but she knew I wasn't clean. Given my experience, I'd be very surprised if your wife was not on to you.
Second, and as perhaps you remember from your last quit, the beginning sucks. It sucks so bad words can't be found to describe it. For me, the aftermath of the suck sometimes was being an irrational dickhead at home, and the wife bore the brunt of some of that. If your wife really doesn't know what you're up to with quitting, you had better hold on to your ass at home - for me, had the wife not given me some substantial leeway in the beginning of the nic withdrawal suckfest (because she knew what was going on) she surely would have kicked my ass out of the house (and been justified in doing so).
We all say around here to take out the suck on the board and not at home. Let's be honest though - it's not always possible. Some of that shit is going to spill out at home whether you want it to or not. So, in my opinion, it behooves you to come clean to your better half.
If you're serious about your quit, and want your quit to succeed, you won't start such a laudable undertaking with another lie. You need all the support you can get, and support from the person to whom you've pledged for better or worse, till death, etc. strikes me as the most important support there is - don't ruin the opportunity to have something to celebrate together (success) by keeping your struggle to yourself. Yeah, when you go tell her that you're hooked on the nic bitch and you've lied about it, she's going to be pretty fucking pissed. I've been there, and I've had to repair the damage my lies caused. But the end result for me has been excellent support for my quit, leeway and understanding when I needed it, and ultimately, a better marriage - there now is nothing to hide, and we're better off for it.
Give it some thought.