SAN FRANCISCO — Most days he is at work at AT&T Park here, Giants pitcher Madison Bumgarner can be seen with a clump of smokeless tobacco lodged in his lower lip. Bumgarner, a World Series hero and the face of the team, grew up in small-town North Carolina, where, he said, nearly all men dipped. He has been doing it since he was in fifth grade.
“Pretty much all the time,” he said.
Next year, though, Bumgarner will have to break the habit, at least at his home stadium. Signaling a profound shift in the culture of baseball, Mayor Edwin M.