This supplement to Tobacco Control reports the results of research that was funded by the state of California’s Tobacco-Related Disease Research Program (TRDRP). In 1989 California voters passed Proposition 99, a ballot initiative that raised the excise tax on tobacco products at the rate of 25 cents per pack of cigarettes, and earmarked 5% of the revenue from this tax for “research on the causes, prevention, and treatment of tobacco-related disease”. The University of California, as the state’s official research arm, administers TRDRP and awards grants to investigators in a variety of scientific and scholarly disciplines at numerous not-for-profit institutions in the state. Since 1990, TRDRP has awarded more than 380 research grants totalling $116 million.

The eight articles in this supplement report research findings relevant …