They think it is unsightly to spit. It's a cultural thing. Tennis is another example. One of the most important things that occurred in this societal change in smoking is when they took cigarette advertisement off television. That was a huge help.
Smoking is no longer cool.
However, the group most affected by smoking is women, especially young women. Women smoke to keep weight off and, in women's sports where weight is a problem, you see women doing a great deal of smoking. For example, gymnasts smoke a lot. The problem for gymnasts is that smoking promotes arthritis, leeches calcium and produces osteoporosis. Women gymnasts have to keep their weight down, so they don't eat and they smoke as an appetite suppressant.