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does chewing tobacco affect fasting blood test How to prepare for a fasting blood test: what Does Smoking Break Intermittent Fasting? A 2025 Health Guide Is It OK to Smoke Before a Blood Test? Fasting Before a Test Did You Know? Fasting before blood work helps give more accurate results. Eating, smoking, or even chewing gum can affect your results. Follow fasting instructions for reliable lab results.
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