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Persistent hoarseness, difficulty in speaking, or trouble in swallowing are other danger signs

NIH State-of-the-Science Conference Statement on Tobacco Use: Prevention, Cessation, and Control

Your doctor will tell you how often you'll need to test and if you should do it at specific times

It enhances objectivity

Tell one or two friends and your family

Int J Occup Med Environ Health 30, 329344