Clark, Miranda, Cooper, Sue, Naughton, Felix, Ussher, Michael, Emery, Joanne, Mcdaid, Lisa, Thomson, Ross, Phillips, Lucy, Bauld, Linda, Aveyard, Paul, Torgerson, David, Berlin, Ivan, Lewis, Sarah, Parrott, Steve, Hewitt, Catherine, Welch, Charlie, Parkinson, Gill, Dickinson, Anne, Sutton, Stephen, Brimicombe, James, Bowker, Kate, Mcewen, Andy, Vedhara, Kavita, Coleman, Tim, "Smoking, nicotine and pregnancy 2 (SNAP2) trial: protocol for a randomised controlled trial of an intervention to improve adherence to nicotine replacement therapy in pregnancy", BMJ Open, 2024