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Nearly two years ago, Jeremiah Mock heard a student in Marin County, California, complain that her school was littered with e-cigarette waste. A health anthropologist by training, Mock did some shoe-leather investigating in a student parking lot, where he found a significant amount of e-cigarette and tobacco trash.

Surprised, Mock went further. From July 2018 through April 2019, he and a colleague, Yogi Hendlin, collected tobacco, cannabis and e-cigarette waste from 12 public high school parking lots across the San Francisco Bay Area. [...]