Nicotine intake depends on vape strength and how often its used
This study also observed that smokers had a higher estradiol level than non-smokers, which further disturbed hormonal balance
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The section on smoking included questions on smoking status (never, current, or ex-smokers), daily number of cigarettes/cigars smoked in different life periods, age at starting, duration of the habit and, for ex-smokers, age at smoking cessation