I Have Smoked A Pack A Day For 30 Years.

I have smoked a pack a day for 30 years. I now only smoke 5 or less cigarettes/ cigarillos a day for the last 2 months. I am on Chantix but it does nothing for my cravings. It does however make me not want the cigarette after tasting it. I have to pass a cotinine blood test for surgery and wanted to know if I could pass a blood test saying I was 90 days cotinine free if I stopped now and took test in a couple of weeks?