Your body temperature goes up when you smoke. Here's why: The temperature at the tip of a cigarette is 95 degrees C, or 203 degrees F. Inhale hot smoke, and it raises your lung temperature. When your lungs are hot, they are unable to perform one of their responsibilities, which is to cool or remove heat from your body. As a result, it raises your core body temperature. Stop smoking, and your body temperature returns to normal within about 20 minutes.