British American Tobacco has a big dividend yield, but it is facing an existential crisis. This is a high-risk/high- return equation. British American Tobacco (BTI 1.02%) has a massive 9.9% dividend yield. If it can sustain that dividend, investors will basically get the average return of the market over time from dividends alone. If the stock price goes up, all of that gain would be gravy. That sounds like a recipe for long-term investment success. But read this before you jump in thinking British American ...