I have recentlly begun a case study on asthma. I am intending to look into hygiene hypothesis and pollution (in other words why has the rate been increasing in recent years?) but also then go on and look at inhaler devices etc.(or treatment). I have looked at the asthma uk publications and there are small things in there that are useful but do you know of any other information sources? Also, I think that it would be interesting if I could get my hands on some inhaler devices so I can have a visual study. Do you know if this is possible? Is there may be a possibility of obtaining placebo ones maybe from manufactures. I am not sure how this process works. How would you go about this? Your help is greatly appreciated...I need information sources!