Is nicotine (as an ingredient) extracted from tobacco?

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Tobacco is indeed the primary source of nicotine used in various products like e-cigarettes and chewing gum. Nicotine can be extracted from different tobacco varieties, including both high-quality types typically used in conventional cigarettes and lower-quality alternatives. The extraction process involves refining and processing the nicotine to make it suitable for consumption in these products. Additionally, nicotine can also be produced synthetically, providing an alternative to plant-derived sources. The discussion highlights the versatility of nicotine sourcing, emphasizing both natural extraction from tobacco and synthetic production methods.
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Is tobacco the source of the nicotine that used as in ingredient in compounds for electric cigarettes, chewing gums etc.? If so, is it extracted from varieties of tobacco that are considered high quality for use in (conventional) cigarettes? - or can inferior quality tobacco be used?
 
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"Extract," refine, process...what do you think?
 
Here's something from Medical News Today:

Nicotine is a chemical that contains nitrogen, which is made by several types of plants, including the tobacco plant. It is also produced synthetically.
(Source: https://www.medicalnewstoday.com/articles/240820#_noHeaderPrefixedContent)

Quite a bit more detail is in the source, although not so much about its manufacture.
 
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