Participants were randomly assigned ( @:@ ) to receive up to @-weeks treatment with NRT ( @ mg/@ 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 @-week supplies ( @ for NRT group , @ for placebo group ) -LSB- Corrected -RSB- .