They are known to be more susceptible to using these products as a way to somehow drown out the negative emotions and thoughts they are feeling and thinking, respectively
The most common types of tobacco leaves that are harvested to produce chewing tobacco are Nicotiana rustica and Nicotiana tabacum
Without thinking about it, people smoke enough cigarettes or use enough tobacco products (i.e., chewing tobacco, etc.) each day to keep the levels of nicotine in their brain at a relatively constant level and to feel the effects all day long
If nothing else, on a practical level, it relieves the league and the union from having to negotiate and enforce rules about this stuff in collective bargaining and, instead, allows them all to simply say hey, dont break the law at the ballpark. In a larger sense, I appreciate that there are some sticky considerations when it comes to regulating the otherwise legal behavior of consenting adults, but I dont lose much sleep over tobacco regulation in public places