Congrats on your decision, if indeed it was YOUR decision. Let me first say that I am VERY much in favor of spousal support. I've posted on here many times that my wife has been very instrumental in supporting my quit. But, with that said, there is a difference in positive support and ineterference. My wife never liked by tobacco use, but she never tried to force me to quit, probably because it she knew it would have been pointless. Neither she nor I really understood addiction, or even knew that it was truly an addiction. Realizing that fact now, I understand that pressure from others can make an addict feel trapped, and inadvertently drive him right back to the can. The more forbidden the substance is, the more rewarding the addiction can potentially be.
I mention this mainly because your intro was all about your wife catching you and disapproving, except for the last sentence. That's only about 9.7 percent about YOU deciding to quit. Some of the vets around here have pointed out that quitting for somebody other than yourself (kids, wife, boss, etc) is opening the door to failure.
Face this shit head-on, quit because your life depends on it, and own your quit. You can do this.