@ArtChoo pure nicotine is classified as a liquid which can oxidize and does react to light (UV). When exposed to certain conditions, it will break down or transform into various acids or salts (Vitamin B3 among them). Keeping snuff in truly air-sealed container and protecting it from light will slow this down. In the dry insecticide form, the nicotine may be in the form of one of its acids or salts, or it could also be in crude tobacco extract form.
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