Background: Dual use of combustible cigarettes and e-cigarettes is increasingly prevalent among adults, yet most mobile health (mHealth) interventions have been designed for exclusive cigarette smoking. Evidence on the effectiveness of mHealth cessation tools for adults who use both cigarettes and e-cigarettes remains limited. This scoping review aims to synthesize published evidence on mHealth interventions evaluated among adults who use both cigarettes and e-cigarettes and identify gaps to inform tailored digital cessation strategies.

Methods: A systematic literature search was conducted in PubMed, Embase, Web of Science, and CINAHL from inception through January 2026. Peer reviewed studies were eligible if they evaluated phone- or mobile-based interventions among adults who use both cigarettes and e-cigarettes. Titles, abstracts and full texts were screened using predefined criteria. Two reviewers independently screened all records in Covidence, and the review follows the PRISMA-ScR guidelines.

Results: The search yielded 1,611 records and 511 duplicates were removed. Of 1,100 titles and abstracts screened, 1,080 were excluded. Twenty studies met criteria for full-text review. Full text screening is ongoing to determine final eligibility and extract data on study designs, mHealth intervention types and components and reported cessation or reduction outcomes for cigarette and e-cigarette use.

Conclusion: This scoping review will synthesize the current evidence on mHealth interventions for adults who use both cigarettes and e-cigarettes to identify gaps in intervention design, tailoring and outcome reporting. Findings will inform the development of tailored digital cessation strategies that address the unique needs of these adults and highlight priority areas for future research.