Welcome to HCM
You are young female with History of hypoglycemia
in family there are many causes of hypoglycemia some are Hereditary and many are acquired one and many drugs can cause what is more common is Non-specific reactive functional hypoglycaemia
But with such history Smoking should be big no no,as there are so many injurious effects of smoking
Please quit smoking and Consult a Endocrinologist
to rule out any cause of hypoglycemia.
Take healthy diet and you will be alright
Please take care
Good luck to you.