Exactly. There can be very many different flavourings and some are probably harmful, just like some food is harmful, particularly if used in excessive amounts.

Exactly. There can be very many different flavourings and some are probably harmful, just like some food is harmful, particularly if used in excessive amounts. Or listening to music at loud levels is bad for your hearing, and still, earphones are not banned (and we don't even have mandatory fuses in earphones to limit the power emitted to ears).