Downey, Cheyenne and Doyle, Brian and Lasheen, Reham A and Stanistreet, Debbi and Allwright, Shane and Bauld, Linda and Blake, Martina and Burke, Sara and Byrne, Molly and Coyne, Jane and Frankland, Fran and Gordon, Claire and Halpin, Sarah and Lowry, Roisin and McAvoy, Helen and Moore, Steve and Murphy, Edward and O'Keeffe, Gabrielle and O'Reilly, Tony and Reynolds, Caitríona and Reynolds, Ciara and Sheridan, Aishling and Siersbaek, Rikke and Smith, Susan M and Sørensen, Jan and Straton, Greg and Tighe, Sarah and Ward, Kenneth D and Williams, Pauline and Kavanagh, Paul and Doyle, Frank (2026) Perceived facilitators and barriers of a co-designed financial incentive intervention for smoking cessation in Ireland: a qualitative investigation. Journal of Health Psychology , Early online .