Participants were randomly assigned ( 1:1 ) to receive up to 8-weeks treatment with NRT ( 15 mg/16 h transdermal patches ) or identically packaged and visually matched placebo patches ( all patches manufactured by and purchased at market rate from United Pharmaceuticals , Amman , Jordan ) , issued as two 4-week supplies ( 521 for NRT group , 529 for placebo group ) [ Corrected ] .