By Fiona Callingham & Joe Smith There are always more coughs and colds going around during the winter, the effects of the lower temperatures on our immune systems and the damp conditions are perfect for catching and passing illnesses between people. However, while a cough would not usually set alarm bells ringing, it can be a sign of something far more serious than just a winter cold. Doctor Sarah Jarvis has warned a symptom that could be mistaken for that of a common cold, the flu or even Covid could actually be a first sign of a more deadly disease – lung cancer. “As winter approaches, it’s …