Doc help me I have been coughing non stop for the past month, I have shortness of breath, I haven't been eating much and I feel fatigued all the time. Whats wrong with me?
Hmm, Let me run a few tests to see whats going on
Do you smoke cigarettes, use any tobacco products, or have you been exposed to any dangerous chemicals?
Yes, I smoke at least three cigarettes a day for the past five years
Sadly the test results show that you have Lung cancer. You have developed lung cancer by smoking all those cigarettes and the smoke you inhale damages your DNA which then affects the cells in your lungs. Then those cells turn into cancer cells and then your cells can't do their job.