Are electronic ciggerettes safer than tobacco?

Probably: But they are far from "safe." they have simply not be studied for long-term effects. The amount of "tars, " the organic compounds in smoke that primarily cause cancer, is certainly less, but the impact of the propellant, propylene glycol, the flavorings and other additives, as well as the oil itself, is not known. They may lure younger people in, cause nicotine dependency, and lead to smoking.

E cigarettes: E cigarettes don't produce tar or carbon monoxide. They may contain nicotine, volatile organic compounds, heavy metals (like lead, tin & nickel), ultrafine particles (which may be drawn deep into lungs, diacetyl & Nicotine which is addictive. REF: https://e-cigarettes.surgeongeneral.gov/ Electronic cigarettes may harm health - especially in young people.