The authors actually state in the full article that “. . . long-term quit outcome was not evaluated in this study, so we can say nothing about effects on subsequent relapse”, and that “The primary outcome was self-reported abstinence for at least 30 days regardless of smoking status at follow-up assessment.” So, with no biochemical verification, and such a short-term measurement for self-reported cessation, one has to seriously question the validity of this research.

David Bareham, Louth, Lincolnshire.