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The name likely arose from the plants ability to grow quickly and easily, much like a common weed

This effect is sometimes referred to as "smokers face", a recognised clinical condition.5

turning the cigarette into the worlds most popular placebo (satisfying the brains hunger for nicotine being the only relaxing factor)

Yes, in those and subsequent years there were a lot of different types of filters, from tobacco, where the smoke cleared the tobacco itself, just cheaper, to the infamous brand from Kent with asbestos, which was more dangerous than tobacco smoke itself

This is one reason smoke odors often persist even after the source of the smoke has been removed