[RESULTS] StopAdvisor helped participants with low socioeconomic status stop smoking compared with the information-only website ( primary outcome : 90 [ 8 % ] of 1088 vs 64 [ 6 % ] of 1054 participants ; RR 136 , 95 % CI 100-186 ; p = 00499 ; secondary outcome : 136 [ 13 % ] vs 100 [ 10 % ] participants ; 132 , 103-168 , p = 00267 ) , but did not improve cessation rates in those with high socioeconomic status ( 147 [ 12 % ] of 1233 vs 156 [ 13 % ] of 1238 participants ; 095 , 077-117 ; p = 061 and 222 [ 18 % ] vs 232 [ 19 % ] participants ; 096 , 081-113 , p = 064 , respectively ) .