Weight gain

This is my second baby and have gained twice the weight I gained with my first

How fast did everyone with their second baby lost the weight? I believe that most of my weight gain not only comes from the food but also because I stopped smoking... I'm planing in breastfeeding for the first 2 weeks and once I stop I can't wait to have a cigarette please don't judge but I've been craving them so bad but I keept strong and didn't have one for the sake of my baby...