Feasibility and acceptability of Indigenous Counselling and Nicotine (ICAN) QUIT in Pregnancy multicomponent implementation intervention and study design for Australian Indigenous pregnant women: A pilot cluster randomised step-wedge trial.

•Resources targeted to Indigenous smoking cessation in pregnancy were well-received.•Health staff were motivated by engagement with Indigenous pregnant women.•Many Indigenous women made quit attempts, and 13.8% quit smoking.•ICAN QUIT in Pregnancy was feasible and acceptable to Aboriginal Medical Services.•Modifications were recommended by health staff to trial design and survey length.