The purpose of this study is to evaluate how using an indoor air quality monitor can promote a smoke-free home for cancer patients who are enrolled in MSK's Tobacco Treatment Program.

Inclusion Criteria:

• Adult (aged >18 years) MSK patients as per the EHR
• Has been referred and enrolled in the MSK TTP and completed the initial counseling session as per the TTP clinical database
• Reports current (within the past 30 days) tobacco use (i.e., cigarettes and/or any other tobacco products) as per the TTP Intake form
• Must be English-speaking in the EHR
• Must be reachable by phone as per self-report
• Must have Wi-Fi available at home as per self-report

Exclusion Criteria:

• Patient reports that no smoking is allowed, by them or anyone else, in the home as per the TTP intake form and/or per self-report

Memorial Sloan Kettering Cancer Center supports the international committee of medical journal editors (ICMJE) and the ethical obligation of responsible sharing of data from clinical trials. The protocol summary, a statistical summary, and informed consent form will be made available on clinicaltrials.gov when required as a condition of Federal awards, other agreements supporting the research and/or as otherwise required. Requests for deidentified individual participant data can be made beginning 12 months after publication and for up to 36 months post publication. Deidentified individual participant data reported in the manuscript will be shared under the terms of a Data Use Agreement and may only be used for approved proposals. Requests may be made to: crdatashare@mskcc.org.