[greymule]

Well, the case book doesn't specify Big League Chew, but here's the citation:

3.3.1.S While on the bench, two players appear to the umpire to be using tobacco. The umpire discovers that the substance is not tobacco, but a tobacco-like product. Ruling: Both players are in violation of the rule and shall be ejected. Even though the players were not using tobacco, they gave the appearance of using a tobacco product, which is not acceptable.