My dad, who smoked for 60+ years got his sense of smell back after only a couple weeks from starting to vape. He can actually smell dinner cooking. But, along with the good, he has to deal with the bad...he made mention that he can smell his pit bull dog's gas (too darned funny)
I had the opportunity not too long ago to walk down to the main office of my apartment complex, just after a rain, while the flowers were still blooming on the trees. I've always thought the after rain smell was fabulous, but now, it is even more wonderful. I could smell all the flora and the rain, I wanted to stay out there for hours and soak up that smell!