cigarette smoking lung cancer pictures causes fatal - Image 2 Lung cancer causes in non-smokers
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We estimate that a $1.50 cigarette tax increase will cause 71,000 adults to quit smoking, 2,500 teenagers to either quit smoking or never start smoking, and adults who never start smoking to gain 45,000 years of life, the report said
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According to a study published in Advances in Dermatology and Allergology, the chemicals in tobacco smoke, including nicotine and various carcinogens, are directly linked with many skin conditions and visible damage such as premature ageing

The level of formality comes from the sentence structure around it, not from the word itself