The second argument/excuse is that e-cigarettes are a "gateway" to tobacco use, particularly for young people. Prohibitionists often resort to gateway arguments when a ban cannot be justified on its own terms. Shaky at the best of times, they can easily be shown to be false in this instance. Yes, e-cigarette use has risen amongst young people in recent years - as a new product it could hardly be otherwise - but this has not led to a commensurate rise in smoking. On the contrary, the rise of vaping has coincided with a substantial decline in youth smoking. In the US, the rapid decline in smoking amongst high school students has correlated so neatly with a sharp rise in e-cigarette use that anti-vaping propagandists have been forced to redefine e-cigarettes as tobacco products in order to claim that there has been ‘no decline in overall tobacco use’.