There is also a tendency on GPs to diagnose an inhaler as an early precautionary measure, when Asthma may not actually happen. I had a lot of asthma like symptoms earlier this year, and it was only a lot of further work to identify that it wasn't Asthma but GERD (a stomach reflux) which has extremely similar physical symptoms but for which an inhaler makes no difference.
Problem is that my Doctor kept saying 'Asthma, take the inhaler' and looking at me when I was mad for saying 'nope'!