There was a significant Stimulus effect (F = 11.95, p < 0.001) on craving, but no interactions with Group or Condition. Paired comparisons showed significantly higher craving after exposure to AO (2.65, SD= 1.30) than after baseline (1.98, SD= 1.08) or the two control odorant classes (NApO= 1.86, SD= 1.01; ApCO= 1.99, SD= 0.984; p < 0.001).