Image source: Altria.Tobacco giant Altria Group (NYSE: MO) has given investors plenty of good news over the years. Not only has its share price soared over time, but it has also successfully fended off several major challenges to its business model. Litigation in the 1990s presented a huge threat to Altria, and its ability to defend against lawsuits with minimal financial consequences has been one of the key reasons that the stock has performed so well.