The U.S. is quite a deregulated society right now, and corporations have a free hand. If the courts cannot keep checks and balances between rampant corporatism and marketing, then no one will be able to. Even though I don't always agree with U.S. 's lawsuit culture, I do believe, within the context of its society only, that it has a useful place.
Also, when it comes to addiction, I see no problem with suing a drug maker. Tobacco is a drug, and the people who smoke it don't often have control, especially longterm smokers. I am not trying to mitigate a person's freedom to choose, but Phillip Morris deals in an addictive drug and makes huge profits off it. I am of the view that more people should be suing them, not less.
If heroin addicts could sue their supplier for ruining their lives, they'd do it too, but heroin is illegal. So, tobacco is fair game. Frankly, so is alcohol... but I believe it to be a lesser evil in this case.