Ar y clawr: Diwrnod dim smygu, Mawrth 10 = On cover: No smoking day, March 10.
OBNB doesn't sell books, but you may be able to find a copy at one of these websites:
Take the plunge = Gwna sblash go iawn. Published by No Smoking Day in 1999. Publication and catalogue information, links to buy online and reader comments.