Everyone in this thread is missing the boat, actually - the 'real' issue at play from the tobacco manufacturer is that there is a strong paper trail suggesting that the tobacco companies a.) knew about the harmful effects of their products as early as the 1940s and b.) systematically sought to hide this information from the American public, through misdirection, sponsoring illegitimate research, and flat-out lying (including to Congress).
This is really the source of their liability - not additives or anything, at least in this round of litigation.
For reasons both obvious and not, it's probably best to do your own research on the legitimacy of these claims - but there is a ton of evidence out there.
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