I think you can apply the same argument to, say, fast food, soda, transfats, and things we KNOW are carcinogenic, yet are still marketed and sold... and literally consumed... couldn't you, dear Snoozy (peace to you!)?
Manufacturers have a duty to warn of their products' "defects" (and causing death is a defect!)... AND do so in a way that the public cannot deny they've been warned. However, when what you're manufacturing is addictive, in addition to causing death... yet you're not saying THAT (indeed, you say everything BUT that, including that it'll make you "cool" and all the guys/girls will "like" you and you will become popular, even famous)... then I think you should be held liable. Your manipulating consumers to their own death... for a PROFIT. You ought to pay someone, somewhere, somehow. More power to the one who causes you to have to.
Also, where addiction is involved, dear one, common sense isn't always an issue. In fact, it almost never is.
Again, peace to you, dear one!
A slave of Christ,
SA