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Sublingually This method includes any product that is held under the tongue and absorbed by mouth

Oxford University Press: 3337

"Method and apparatus for making banded smoking article wrappers - US Patent 5342484"

Right after you quit, your airways begin to see a decrease in inflammation, and the cilia little hair-like things that line them begin to work again after a smoke-induced paralysis

UPDATE: In Episode 5, we learn the scientific mission did encounter a female survivor

[12] Moreover, handling concentrated nicotine solutions without proper protective equipment can lead to poisoning through skin absorption or accidental ingestion