The internal consistencies of three habit-specific locus of control sc
ales measuring drinking, smoking, and eating behavior were evaluated u
sing coefficient alpha. The three scales, along with Rotter's I-E scal
e, were administered to 202 undergraduate students. Estimates indicate
d the scales showed reasonably high internal consistency. Scores on th
e smoking and drinking scales had the lowest correlations with scores
on Rotter's generalized measure. Mean drinking scale scores were lower
than those for smoking and eating, suggesting that people judge drink
ing to be under more personal control. The implications of habit-speci
fic expectancies, particularly with regard to habit disorders, are dis
cussed.