<s>[INST] Hi I just turnt 16, I have been smoking since i was 14 and For the past few days I've been worrying If i have lung/mouth cancer because I was been coughing continously, sneezing, got ulcer in my mouth and have a back pain in the middle of my spine. what does this mean? what shall i do? [/INST] Hi Welcome to HCMI have gone through your query and found you to be wise enough to  understand & worry  that your smoking  may have lead you  to cancer .Dear, you are too young to do all that and fall into this ditch . Anyway ,don't get panicked . You must go to the doctor to get yourself checked up thoroughly and get treatment ASAP as per your  doctor's advice  . Meanwhile take care of your self . Stop smoking  and fried ,fast foods , tea ,coffe , alcohol ,late nights . Take  simple  healthy food  - veges ,,fruit , protein , vitamins, and minerals , lemon water before meals  Garlic ,ginger are very good for curing many of your symptoms  . Take 1/2 spoon turmeric with  a cup of hot milk before bed time .Keep constipation at bay . .Good night sleep , and walk and exercise .Prayer and meditation gives you peace and show the right  way of leading life. And don't worry , god willing you will be well soon . Go to doctor ASAP Hope it helps you solve your query .Don't hesitate to get back if have any further problem </s>