cigarettes destroy your lungs Effects of smoking on How Smoking Affects Your Lungs

Nicotine also suppresses insulin output from the pancreas, which means that smokers, especially those with cigarette addiction, are always slightly hyperglycemic (i.e., they have elevated blood sugar level)

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Changes in Smoking Cessation Effectiveness from E-cigarette Use E-cigarettes in the UK are increasingly evolving along a "harm reduction tool" pathway, transitioning from a "smoking cessation aid" to a "cigarette substitute." Dual users (daily smokers + daily e-cigarette users) plummeted from 44% in 2015 to 14% in 2025, indicating a significant weakening of concurrent daily dependence on both products

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