Oh 2013.

Methods	Prospective randomised controlled study
Participants	58 active smokers who presented to an academic otolaryngology clinic
Interventions	∙ Received a free copy of the book, Allen Carr’s The Easy Way to Stop Smoking ∙ Received only the name of the book and author Both cohorts received physician‐directed cessation counselling
Outcomes	Follow‐up phone calls were conducted at 2 weeks and 6 months to assess smoking status, whether control group participants bought the book, and how many pages of the book were read
Notes	Study authors contacted for further details but no response yet