Cape Cod

Hi everyone, this is my first post. I have been considering WLS for a while. I was going to get the gastric balloon but then I did some research and don't thinks it's a good option. Anywho I called my insurance yesterday (United healthcare) my bmi is 35.1 with high cholesterol and I meet my employers 2 yr employment requirement. So they approved me to go to the next step which is speaking with a nurse scheduled for today. They also said I need to participate in a 6 mos diet. So questions.... I have been on weight watchers - unsuccessfully- actually been paying for a membership I can prove since May) will this qualify for the 6 mos supervised diet? What is the goal of the diet? If I do the diet and drop my weight I'll drop under 35 BMI but even if I lose weight I'll probably gain it back like I have on every diet I've ever done. I can also prove I was on ideal protein for over 6 months in the past 2 yrs. will these count? Lastly I quit smoking but I Vape. What is the smoking concern. Thanks everyone for your advice in advance.