The FTND is a tool commonly employed to assess the level of nicotine addiction. It consists of six questions pertaining to smoking-related behaviors. The questions with binary (yes/no) responses were scored on a scale ranging from 0 to 1, while multiple-choice questions were scored from 0 to 3. The resulting score determines the degree of nicotine dependence, with a prescribed categorization: 0–3 points indicating low dependence, 4–6 points indicating moderate dependence, and 7–10 points indicating high dependence [23].
The FTND has been recognized as a valid and reliable method for measuring nicotine dependence in the Polish population [24,25].
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