It's been a tough year for Altria Group (NYSE:MO) and most of its tobacco-stock peers. Bearish investors point to all kinds of headwinds for the tobacco giant, including threats of tougher regulation from the U.S. Food and Drug Administration and ongoing shifts in consumer demand toward e-cigarettes and other alternatives to Altria's Marlboro cigarette brand. Amid all this controversy, marijuana stocks have been all the rage in the investing community. [...]