I was wondering if using the inhaler during fasting breaks your fast? Can you please explain if it does or not?
In the Name of Allah, the Most Gracious, the Most Merciful.
As-salāmu ‘alaykum wa-rahmatullāhi wa-barakātuh.
In principle, if only air is taken in the body, the fast is not invalidated. However, if any medication is entered into the body, the fast will be invalidated.
Hence, the usage of an inhaler will invalidate the fast.
And Allah Ta’āla Knows Best
(Mufti) Abdul Azeem bin Abdur Rahman
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 فتاوى محمودية، ج 10، ص 154-155، فاروقية