A holding chamber or "spacer", such as an Aerochamber helps using a metered dose inhaler (MDI). Metered Dose Inhalers are used to get medicine directly into the lungs where it is needed. This allows the medicine to work quicker than the same type of medicine taken by liquid or pill form. Instructables link: https://www.instructables.com/id/DIY-SPACER-AEROCHAMBER-Covid-19-Protecting-Our-Fro/