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Quitting smoking can be a difficult process, whether youre a pack-a-day smoker or rely on an e-cigarette

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Dimensions: 4256 x 2832 px | 36 x 24 cm | 14.2 x 9.4 inches | 300dpi Date taken: 4 May 2011 Photographer: dpa More information: This image could have imperfections as its either historical or reportage.

Its unclear as to what causes the mutations in DNA that lead to oral cancer, though there are risk factors that include, according to the Oral Cancer Foundation: Tobacco use Heavy alcohol use Human papillomavirus (HPV) A weakened immune system Excessive sun exposure to the lips If youre concerned that you may have oral cancer, your doctor will perform a physical examination of the area and may take a small sample of cells, called a biopsy, for testing