NCI launches smoking cessation support for teens teen.smokefree.gov or TEXT 47848 (iQUIT) A new effort to help teens quit smoking will use one of today’s most constant companions — the mobile phone. Developed by smoking cessation experts, SmokefreeTXT is a free text message cessation service that provides 24/7 encouragement, advice, and tips to teens trying to quit smoking. The initiative is led by the National Cancer Institute (NCI), part of the National Institutes of Health. Once they sign up, teens receive text messages timed according to their selected quit date. Following their quit date, they will continue receiving texts for up to six weeks