In circa 2022 I got covid and lost smell. First I couldn't smell the spices in the kitchen, but I thought nothing of it. But some days later, I couldn't smell WD-40. That's when I noticed I can't smell anything at all. My sense of smell never really recovered. After about a year, I could faintly smell menthol. Now I have to really try hard if I want to get some faint sense of smell, but a lot of time I just don't smell anything.