Internalizing symptoms associated with nicotine and THC vaping and poly-product use among youth and young adults. - McLeish, Alison C.; Tomlinson, Madeline M.; Willett, Jeff; Groom, Allison; Landry, Robyn; Bassett, Angel; Dunn, Mary; Hart, Joy L.; Walker, Kandi L.; Kesh, Anshula; Robertson, Rose Marie (Addiction Research & Theory, 2026)