Hi welcome to healthcare magic forum,
Smoking is allways injurious to health. As you told productive cough and voice change and sore throat
indicate lower respiratory tract
infection and acute laryngitis
. I suggest to take a broad spectrum antibiotic and a cough formulation for 3 - to 4 days along with voice rest and plenty of water and quit smoking. If you wont got relief then you must see a medicine specialist or an ENT specialist
for a complete checkup.