If the cigarette lighter adaptor breaks in flight, it does not make your ship unairworthy
While there is no proof that e-cigs are safer than traditional cigs, the less chance of starting a fire, not smelling like an ashtray, and the environmentally-friendliness of Vuse over analog cigarettes makes it a far better option over regular smoking
There is some weak data for this treatment, and it does not come with any known serious side effects (Dean et al 2020)

Self-balancing or self-riding bags Camping equipment that contains any kind of fuel Self-defense sprays (mace, pepper sprays, tear gas) Torch lighters Explosives (fireworks, gunpowder, flares, flare guns, or novelty items) Ready-to-eat meals that include flameless heaters Shock absorbers Tasers Knives, guns, or other weaponry Sporting equipment which could be used as a weapon Avalanche packs containing 1.4s or CO2 Recalled, damaged, or defective batteries Certain everyday household items also fall under United Airlines prohibited items list, and cannot be packed in carry-on or checked bags: Aerosolized spray paint, household cleaners and pesticides Bleach Drain cleaners Epoxy Fuel Gel fuel Glue Insecticides Matches (the strike-anywhere kind) Paint Torch lighters Spray starch Recreational self-propelled vehicles and devices designed to carry people and goods have the potential to injure passengers and crew, and as such are not allowed as carry-on

In Singapore, about six Singaporeans die prematurely from smoking-related diseases each day