A week after announcing the launch of a group to abolish nuclear power, former Prime Minister Morihiro Hosokawa has decided to slow the pace of his efforts due to poor health, the group said Thursday.

Hosokawa, 76, launched the Japan Assembly for Nuclear Free Renewable Energy on May 7 with former Prime Minister Junichiro Koizumi and a group of scholars and activists to promote a "zero nuclear" nation.

At the inaugural meeting in Tokyo, however, Hosokawa felt dizzy during his speech and could not clearly read the manuscript, according to Ikko Nakatsuka, who leads the administrative aspects of the council. He also suffered four chipped teeth and a bloody lip in April after taking a tumble at Shinagawa Station in Tokyo, he said.