I am a non-smoker who has given four friends an Ego-T tank system electronic cigaret as a gift. The friends varied from moderate social cigaret smokers to a heavy three pack a day smoker. Only one still vapes and smokes occasionally. She uses non-nicotine e-juice but will bum a real cigaret off a friend occasionally to smoke with them socially. . . but always says it tastes horrible. The rest, including the three-packer have quit completely! It took just three months to four months for them to stop.
That is what terrifies the tobacco companies.
And the government.