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This would be like having a single neuron that fires when you see a photograph of your grandmother, hear her voice, read her name or perhaps even smell her familiar perfume.

Then she pulls out a fancy perfume bottle and wafts it under her nose, inhaling a chemical approximation of the scented flora surrounding them.

"Even when I was first fit with the mask, I had to spray perfume in it to be able to put it on in the first place because it smelled like intensive care."

The smell of caramelized onions, garlic and tomato sauce perfumes the air.

"Tiger Balm is the new coffee," said one user, while another quipped, "I apply perfume between my nose and lips now – saving it just for myself."