It often takes a long time for health policy influencers, advocates, and proponents to admit fault. 

When it is about topics such as diet fads, saturated fats, food pyramids, and sugar consumption, long-held consensus beliefs and government actions later proved erroneous have had a lasting negative impact.

But nothing has been more egregious and harmful in our current age than the public health lobby’s persistent denialism of the harm reduction value of nicotine vaping products and other alternatives to cigarettes.