Re: Addiction: yup
(Seriously though, breathing in any sort of vapour is probably not good for you, even if it's orders of magnitude less risky than smoking).
So why do doctors prescribe inhalants for asthma sufferers? The amount of water vapour in the air when I visit Darwin, or Brisbane is pretty terrifying (for you I guess, not me) not to mention when I take a bath. Hell, when I take a walk through the forest on a warm to hot day, the odour of eucalyptus vapour is almost overwhelming. What a pitifully limited life some people subject themselves to.