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The researchers collected detailed annual information on respiratory health, and active and second-hand nicotine vaping, and conventional tobacco and cannabis smoke exposure in the household from 2014, when participants were 17, on average, to 2019, they said

The federal Tobacco 21 law came into effect by the end of the year

"The ulcer sleuths: The search for the cause of peptic ulcers"

So the residue is being wiped away and getting harder to find

The CEC includes undergraduate and medical student summer interns, predoctoral scholars enrolled in doctoral programs at the College, postdoctoral fellows and faculty investigators new to tobacco regulatory science