The purchasing power parity-adjusted incremental cost per quitter from the intervention is $ 281 ( 95 % CI = $ 187 , $ 562 ) , less than for nicotine gum ( $ 1780 , 95 % CI = $ 1414 , $ 2401 ) or varenicline ( $ 2073 , 95 % CI = $ 1357 , $ 4388 ) in Thailand .
