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Here are some early smoking mouth cancer symptoms that often get ignored: A mouth ulcer not healing for more than 2 weeks White or red patches inside the cheek, tongue, or gums Pain or burning while chewing or swallowing A lump or thickened area inside the mouth A feeling that something is stuck or rough in one spot Slight change in voice or discomfort while speaking None of these feel dramatic at first

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Mendelian randomization (MR) study uses genetic variants as instrumental variables to explore the effects of exposures on outcomes, reducing potential biases caused by confounding and reverse causation 14

Most particles form in the atmosphere as a result of complex reactions of chemicals, such as sulfur dioxide and nitrogen oxides -- pollutants emitted from power plants, industries and automobiles