An official website of the United States government
The .gov means it’s official.
Federal government websites often end in .gov or .mil. Before
sharing sensitive information, make sure you’re on a federal
government site.
The site is secure.
The https:// ensures that you are connecting to the
official website and that any information you provide is encrypted
and transmitted securely.
Dierker L, Stolar M, Lloyd-Richardson E, Tiffany S, Flay B, Collins L, Nichter M, Nichter M, Bailey S, Clayton R; Tobacco Etiology Research Network.Dierker L, et al.Subst Use Misuse. 2008;43(5):680-99. doi: 10.1080/10826080701202684.Subst Use Misuse. 2008.PMID: 18393083Free PMC article.