I use three different inhalers, Airomir, Spiriva, and Symbicort for the COPD I have. I have not noticed a increase in the readings after using them. They must be lost in the background.
I will check again this morning but I am sure that the reading will be the same.
Studies have indicated some evidence that inhaled glucocorticoids particularly in high doses may have an adverse effect on the progression of T2 diabetes, as well increasing the risk of developing it in the first place. Of course that possible risk needs to be balanced against them being very effective in treating asthma.