At midnight on Aug. 23, the second tranche of President Trump’s tariffs officially took effect, levying a 25% tax on 279 products from China, including electronic nicotine delivery systems (ENDS). While politicians, pundits and economists argue about the diplomatic and trade value of such actions, convenience store and vape shop owners and operators brace for the probable financial fallout.

“It definitely will have an effect on profit margins, but to what extent I’m not sure yet,” said Tim Greene, [...]