Study finds substance abuse still common at age 35.

The proportion of 35-year-olds who abuse alcohol and use illicit drugs is higher than might be expected, according to a study conducted by researchers at the University of Michigan.

More than 32 percent of 35-year-old men surveyed reported heavy drinking-- defined as having five or more drinks in a row--at least once in the past two weeks. Nearly 13 percent of men and 7 percent of women report using marijuana in the past month, and 7 percent of men and 8 percent of women report misusing prescription drugs in the past year.

The study is published in this month's American Journal of Public Health, and is based on the responses of 7,541 people from the most …