New anti-smoking legislation on second-hand smoke exposure of 38 children in homes SSCChan,DYPLeung,YWMak,GMLeung,SLeung,THLam New anti-smoking legislation on youth smoking and quitting 43 behaviours via a smoking cessation hotline SSCChan,DYPLeung,AYMLeung,DOBLam,DYTFong,THLam