Teens increasingly are turning to nicotine-loaded gum, lozenges and gummies for a quick rush, a groundbreaking study warns. Tobacco-free oral nicotine products were the second-most commonly used nicotine or tobacco items among more than 3,500 Southern California ninth- and tenth-graders surveyed last fall, researchers reported Aug. 8 in the journal Pediatrics. About 3.4% of respondents…