These bans on flavored e-cigarettes could do more harm than good.

Vaping may be harmful. Smoking kills.

Something very curious is happening as anti-tobacco groups led by the Campaign for Tobacco Free Kids seek city-by-city, state-by-state bans on flavored tobacco products.

They have succeeded in just one state — Massachusetts, which ended the sale of all flavored tobacco products, including menthol cigarettes, e-cigarettes and cigars, last June. In a…