When my brain is too busy and music or an audiobook/podcast while working makes it worse instead of better, these are a lifesaver.
I donāt know what possessed my flatmate to get one of those reed oil diffusers when I have a sinus and throat reaction to any chemical smell stronger than dishwashing liquid and after two hours I had to go find the cap and get it ready to go to the bin because I canāt breathe and am coughing.
(I donāt have a flatmate)