These come from the following e cig reviews:

Doesn’t leave a lingering smell. While e cigarettes may leave a faint trace of smell, this will quickly dissipate, so you don’t have to worry about the smell of smoke clinging to your clothes after you smoke.

Doesn’t leave any messes. With e cigarettes, you don’t have to worry about disposing cigarette butts or ashes, making these a more convenient option.

Doesn’t cause oral problems. Unlike conventional cigarettes, e cigarettes neither stain nor discolor teeth, so you don’t have to worry about damage to your pearly whites whenever you reach for one of these.

No fire hazard. With e cigarettes, you don’t have to literally light up in order to smoke, making this a safer option where fire hazards are concerned.

There are more, but these will get you started!