Are e-cigarettes healthy?

Clearly, the answer is no.  It is best not to smoke at all.  From a policy perspective, however, there is a question of whether e-cigarettes should be regulated and taxed heavily–like regular cigarettes–or more lightly.  If e-cigarettes are relatively healthier than standard cigarettes, less taxes/regulation would be merited.  If, however, e-cigarettes induce more individuals to…