Advocates for e-cigarettes are perplexed as to why the Trump Food and Drug Administration is taking such an aggressive posture against the industry, especially after other agencies like the Environmental Protection Agency have adopted more industry-friendly policies.

E-cigarette advocates have said they are disappointed in the FDA’s threats of bans on e-cigarette sales in convenience stores and new regulations. The FDA has ratcheted up scrutiny of the burgeoning industry in response to what the agency calls an “epidemic” of e-cigarette use among minors.