Smoking behavior was investigated with data from a three-generation study of Mexican Americans in San Antonio, Texas. Rates of smoking among the men were found to be higher than rates for other White men obtained in previous studies, while rates for women were slightly lower than those reported for other White women. However, the percentage of light smokers was considerably higher among Mexican Americans than among other groups. There was no evidence that acculturation was a consistent predictor of greater likelihood of smoking. However, there was evidence that the smoking behavior of younger Mexican Americans, particularly the women, was associated with the smoking behavior of their parents.