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This residue is sometimes referred to as third-hand smoke

Finally, you have to recognize that the wrapper leaf on the outside of your cigar is incredibly sensitive to the ambient atmosphere around you

Do not smoke

The scale of the challenge means there is a need to raise awareness with clinicians and policymakers of the other risk factors including indoor and outdoor air pollution. Paul Cosford, Lead Author Risk factors for non-smoking associated lung cancers include: Second-hand smoke (15% cases) Exposure to occupational carcinogens (4% cases in females, 21% cases in males) Outdoor pollution (8% cases), Exposure to X-rays and radon (about 1.3% cases)