In 2017 and 2018, the Vapor Technology Association met at Trump's hotel to strategize how to lobby the administration. A Republican lawmaker advised it to emphasize jobs created by the industry and how regulation could devastate hundreds of small vaping businesses.

It all worked until hundreds of breathing problems among users of e-cigarettes led the Trump administration on Wednesday to propose banning flavored e-cigarettes popular with teens.

Ethics experts say such a conflict is an example of why Trump should not do business with those seeking to shape policy.

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