human 4 nicotine replacement therapy Article 3 adult 3 female 3 major clinical study 3 male 3 smoking cessation 3 Adult 2 Female 2 Humans 2 Male 2 Smoking 2 Smoking Cessation 2 controlled study 2 cross-sectional study 2 prescription 2 smoking 2 smoking cessation program 2 tobacco dependence 2 young adult 2 (MeSH) 1 Adolescent 1 Aged 1 Attitude to Health 1 Behavior change 1 COVID-19 1 COVID-19 pandemic 1 China 1 Cross-Sectional Studies 1