First of all let it be clear to your that ASPAVOR has nothing to do anything with your weight.
Cessation of smoking
does tend to cause increase in weight but it is temporary and is reversible.
If you are not loosing your weight inspite of running more than 50 miles a week along with strict dieting,then the cause for it should be found out.
The most likely medical reason could be hypothyridism or some other hormonal
Consult your doctor for specific tests to be carried out.
In the mean while carry on with our diet and regular running.