I'll have to have another one and see.. (not!)
Tries to get my dh to have a puff,but he demurred,saying he needed to be with it in case things went pear shaped (which didn't do much for my confidence..)
I used to hang out with the med students when I was at Uni in NZ, and they regularly brought a tank along to parties - was always very entertaining!
I remember a med student friend of mine telling me a story about a woman on his obstetrics run who used the gas & air mouth piece thingy to hit her husband while yelling 'It's all your f*ing fault' - friend said he thought it had the same therapeutic effect as actually using the gas and air...