Trends in smoking and their meaning.  [electronic resource] 

 -  The Harvard mental health letter  Apr 2002 
 - 8 p.  digital 
<br/><br/> Publication Type: News 
<br/><br/><label>ISSN: </label>1057-5022 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Age Distribution<br/>Health Surveys<br/>Humans<br/>Smoking--trends<br/>Tobacco Use Disorder--etiology