通过由美国四大烟草公司和1998年美国46个州总检察官所达成的《烟草大和解协议》所泄露出来的烟草行业内部文件明确显示了制定相关条款完全必要。
The need for that provision was made apparent by internal tobacco-industry documents released through the Tobacco Master Settlement Agreement, reached between the four largest US tobacco corporations and the attorneys general of 46 US states in 1998.