Hi Wendy
The facts you have provided do not factor in things like age and lifestyle.
You could keep a food diary for 2 weeks and look at your caloric intake. Alcohol may be a contributing factor, as it has a lot of calories.
Hormones can be a factor - are you perimenopausal? Are you pregnant? Some women with polycystic ovarian syndrome lay down fat more efficiently than others.
There are lots of metabolic reasons why people gain weight, so if your review of your diet shows you are not overeating, I would consult a doctor, but only after giving your body time to adjust to all of the changes you are putting it through. We alos do not lose weight as quickly the older we get.
Good on you for giving up smoking. Latest research shows it is healthier to be a little overweight than a smoker.
Kindest regards,
Heidi