43yo female 20aday smoker xray show calcium spots not there last yr possibility of cancer developing ?

X-ray Calcifications: Typically, primary lung cancers don't make their presence known as minute calcifications on x-ray; these are more likely to be of infectious origin. Certain endocrine conditions can cause calcificafions. You did not say how large the calcifications are - large calcifications require immediate attention. To be on the safe side, you should follow up with your doctor.

Hard to say: Depends on the pattern of the calcifications. In general, areas of calcium are more consistent with a granuloma, which can occur after exposure to certain fungi (like histoplasmosis if you live in the midwest, or coccidiomycosis in the far west), or tuberculosis. Your doctor should be doing tests for tb, and likely will consider a chest ct scan and further testing. Work on smoking cessation asap.