Engagement With Stop Smoking Services After Referral or Signposting: A Mixed-Methods Study. - Pope I; Rashid S; Iqbal H; Belderson P; Ward E; Clark L; Conway T; Stirling S; Clark A; Agrawal S; Bauld L; Notley C (Nicotine & tobacco research : official journal of the Society for Research on Nicotine and Tobacco, 2025)