Welcome.
You never quit before. You just stopped for a scosh.
Also you didn't pick up a "habbit", you became a nicotine addict...we all did somewhere along the line.
Sucks, but it is what it is.
Read the welcome center tab at the top left of the screen and learn how to post role and start doing so.
Finally, you are right it is time for you to be a real man, but not for your wife and kids but for YOU.
Wife+Kids=Great motivation but ultimately whether you succeed or fail will be determined by your desire to quit for YOU.
YOU got this shit bro, WE will help.
Welcome again, and thanks for your service.