Hi Prakhar892, Thank you for your questions regarding if any tests would show that you smoke before gynecomastia surgery. Yes, there are blood and urine test to determine nicotine levels. Typically, these tests or not routinely performed unless there is a concern for high nicotine levels. If you do smoke, do yourself a favor -- quit smoking. If you are considering gynecomastia surgery or any other plastic surgery and you do smoke, do not have plastic surgery. If you smoke and how gynecomastia surgery, your risks for complications significantly increase. The short list of risks associated with smoking include blood clots, poor wound healing, partial or complete nipple death, and pneumonia. Long-term effects of smoking include cancer most every organ. Smoking causes cancer in the lungs, kidneys, bladder, colon, esophagus, liver, pancreas, stomach, and cervix. Don't ignore the facts. Every year in the USA, about half a million people die due to smoking. Every year in India, about one million people die due to smoking. Please stop smoking. Live longer; stop smoking. I hope I have stressed the importance of not smoking, and especially before gynecomastia surgery. Sincerely, Dr. Katzen.