Oxygen may not be as fun as what your dentist gives you, but it's a gas all right. Now a new "oxygen bar" at BT2 on Grafton Street in Dublin is offering a month's unlimited supply of the stuff for £10.
The price includes a kit with two masks, one for the nose and one for the mouth, as well as an aromatherapy tube filled with essences of Florida grapefruit, Moroccan peach and Javanese vertivert to enhance the gas.
Oxygen-heads can go as often as they like and even bring a friend to use the second mask. The maximum safe intake is three 20-minute sessions per day.
For both masks, it is best to breath in through the nose and out through the mouth. A dial allows users to gauge the jet's intensity.
Under advice from the jaunty shop assistant, I went straight for the nose and adjusted the speed to the recommended low.
Claims abound regarding the mild high, and they are true - but don't worry, you won't be wearing any lampshades, unless you combine your oxygen therapy with champagne therapy.
As for why someone would pay for something they can sniff for free, on any average clear day, the air we breathe consists of 21 per cent oxygen, 78 per cent nitrogen and 1 per cent suspicious elements we are better off not knowing about.
BT2's O2Live oxygen hook-up feeds 95 per cent pure oxygen into the lungs for 10 minutes at a time.
Adherents say the benefits range from curing hangovers to counteracting the effects of ageing. The use of oxygen is approved by the US Food and Drug Administration for the treatment of migraines and headaches.
Whether you feel like legging it down to Grafton Street when you have a migraine is another matter.
The American Lung Association's opinion, however, is that inhaling oxygen recreationally is unlikely to have a physiological benefit.
It also says high levels of oxygen may cause anxiety, drowsiness, confusion or irregular breathing.
In fairness, the association adds there is no evidence that the low flow levels used in oxygen bars are dangerous to a normal person's health.
As oxygen increases endurance and renews energy after physical exertion, boosts are best suited to athletes and club kids hammering to trip-hop at 2 a.m.
At the very least, there is no harm in trying it, and the cost is reasonable enough to satisfy just about anyone's initial curiosity.