Excessive drinking or smoking by a husband or wife can strain a marriage. However, is it substance use specifically that causes problems within a relationship, or is it the difference in the amount of drinking and smoking between a husband and wife that loosens the ties that bind? That question is the crux of a report by Gregory G. Homish, Ph.D., assistant professor of health behavior, and colleagues in University at Buffalo's School of Public Health and Health Professions and UB's Research Institute on Addictions.