Hi,
There are two issues here.
The first is the family history, find out what specific cancers they had and what ages the disease became manifest. Not all cancers have a clear family history. For lung cancer, there are no clear lung cancer families. This is because of the confounding effect of smoking- so the degree to which the disease is attributable to genetic predisposition is inconclusive. If it is lung cancer for one member and then different other cancers for the others – this may be more significant. Keep in mind that you have to keep two counts, for family members on the paternal and the maternal side.
The second issue is lung cancer and smoking. It is true that smoking accounts for majority of lung cancers. The symptoms unfortunately are non-specific. If you are having some pains in the lung when you sneeze, there may be some problem in the lung related to smoking damage not necessarily cancer. It may only be a muscle between the rib that spasms when the sneeze is too forceful.
The best advise I could give you is to quit smoking. I hope there are smoking cessation clinics accessible to you. The second thing is to get yourself examined by a doctor, to investigate the pain.
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