Hi.. Welcome to HEALTHCARE MAGIC.. I have gone through your query and can understand your concerns.. As per your complain cough can occur due to a number of causes like bronchitis, allergies, respiratory tract infections etc.. Smoking can also cause coughing episodes as the smoke can cause irritation and dryness in throat along with it it can also cause constriction of the bronchioles due to irritation with smoke and chemical particles leading to cough.. Sinus congestion can occur due to infection and inflammation in sinuses as well as smoking can cause exaggeration of the condition.. I would suggest you to consult an Otolaryngoloist and get her evaluated and a clinical examination and investigations like chest x ray, throat swab culture and PNS view x ray or MRI of salivary glands can help in diagnosis and treatment can be planned accordingly.. The first thing that is advisable is to completely stop smoking.. Using Nicotine Replacement Therapy like Nicotine patches and chewing gums can reduce the urge to smoke.. She can also be advised to take a course of antibiotics, anti inflammatory painkillers, decongestants oral as well as nasal, cough suppressants containing Gueifenesin etc.. Anti allergics like Levocetrizine and Monteulokast can further help.. Hope this information helps.. Thanks and regards. Dr.Honey Nandwani Arora.