In 1998 seven plaintiffs represented by lawyer Yoshio Isayama sued JT at the Tokyo District Court for ¥70 million compensation (¥10 million per plaintiff) for health damage caused by smoking JT cigarettes.
In January 2005 plaintiffs Kenichi Morishita, Koreyoshi Takahashi, and Masanobu Mizuno filed a case in the Yokohama District Court against JT seeking ¥30 million in damages for smoking related illness.