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PMID: 31042077

and 2) Have you used conventional cigarettes, electronic vaping cigarettes (EVCs), heated tobacco products (HTPs) within the past 30 days?
It seems reasonable to expect, for example, that a 10% change in the price charged for a visit to the doctor would yield a different percentage change in quantity demanded than a 10% change in the price of a Ford Mustang

Abbey, too, positions himself between

Self-reported use of e-cigarettes & other quit methods

it is an ongoing process filled with new findies, challenges, and triumphs
