Methodology and measurement for examining short-term and long-term effects of e-cigarette and polysubstance useBUU, YUH-PEY A and LIN, HSIEN-CHANGNational Institutes of Health (NIH), National Institute on Drug Abuse (NIDA) (ID: 5R01DA049154-03), $696,508USD, 2019-08-15 -- 2023-06-30