Yes. Many lung conditions are associated with clubbing, as well as heart and liver issues. If you have clubbing, you should see your doctor, partciualrly if you are a smoker.
Clubbing. Describes the bulbous, clublike deformation of the distal portion of the fingers and toes resulting from connective-tissue proliferation. Clubbing may be hereditary, ie, primary hypertrophic osteoarthropathy, but, more often, it is acquired and is associated with a number of infectious, inflammatory, neoplastic, and vascular disorders. It may occur with several lung diseases. Ref:Medscape.