After air-conditioned and slow-massage front seats, it was hard to imagine what possible new take on ‘luxury’ car manufacturers would dream up next.

Well, a couple of weeks ago in Japan Infiniti (Nissan’s premium brand) gave me a glimpse of its latest ‘well being’ innovation.

Infiniti engineers say they have gone to great lengths with the new M-series saloon (which is due in the UK next year) to improve ‘life on board’. The main technology involved will be a new climate control system, which combines ‘breezy air’ with an aroma diffuser. With typical Japanese thoroughness, Infiniti has not just bunged any old air-freshener into the air-con, but has developed two special aromas, ‘Leaf scent’ and ‘Forest air’.

The ‘Breezy Air’ technique is quite simple. Instead of the climate control blowing air out of the vents at a constant rate, it simulates a natural breeze by going through a cycle of blowing softly and strongly.