Associations Between Product Type and Intensity of Tobacco and Cannabis Co-use on the Same Day Among Young Adult Smokers: Smartphone-Based Daily-Diary Study

Nhung Nguyen   ^{1, 2} , PhD ;   Johannes Thrul   ^{3, 4, 5} , PhD ;   Torsten B Neilands   ⁶ , PhD ;   Pamela M Ling   ^{1, 2} , MD, MPH

¹ Center for Tobacco Control Research and Education, University of California San Francisco, San Francisco, CA, United States

² Division of General Internal Medicine, University of California San Francisco, San Francisco, CA, United States

³ Department of Mental Health, Bloomberg School of Public Health, Johns Hopkins University, Baltimore, MD, United States

⁴ Sidney Kimmel Comprehensive Cancer Center at Johns Hopkins, Baltimore, MD, United States

⁵ Centre for Alcohol Policy Research, La Trobe University, Melbourne, Australia

⁶ Center for AIDS Prevention Studies, Division of Prevention Science, University of California San Francisco, San Francisco, CA, United States