A decade ago we published a book reporting an extensive analysis of nationwide panel data from the Monitoring the Future (MTF) project showing impacts of post-high school experiences on substance use (Bachman, Wadsworth, O'Malley, Johnston, & Schulenberg, 1997). One of the most important findings was that various categories of marital status, including engagement and divorce/separation, showed substantial impacts on young adults' use of cigarettes, alcohol, and illicit drugs. MTF now has data extending to modal age 45. Using these new data, we revisit the effects of marriage on substance use, which we have termed "marriage effects," and consider two questions: (1) Have marriage effects changed in recent years? and (2) Are substance use effects of marital status transitions different when those transitions occur during ages 30-45, versus ages 19-30? (Contains 2 footnotes, 9 figures, and 3 tables.) [For "Monitoring the Future Occasional Paper Paper 67," see ED508290.]