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Knowledge, Attitudes and Behaviors Regarding Marijuana: Results of a Public Opinion Survey in San Mateo County <br /> © 2016 BRIGHT RESEARCH GROUP | 8 <br /> <br />KNOWLEDGE  OF  MARIJUANA’S  HEALTH  IMPACTS   <br />There  is  a  lack  of  consistent  knowledge  about  the   <br />effects  of  marijuana  on  someone’s  health.  When  asked   <br />about  the  general  potential  for  harm  when  using   <br />marijuana,  respondents  varied  in  their  knowledge  and   <br />beliefs  about  how  harmful  it  could  be,  with  30  percent   <br />saying  “very  harmful”  and  23  percent  saying  “not  at  all   <br />harmful.”  Respondents  were  also  asked  about  their   <br />beliefs  about  the  specific  health  risks  related  to   <br />marijuana  use.  In  several  areas—such  as  the  impact  on   <br />existing  mental-­‐health  conditions,  secondhand  smoke   <br />and  the  potential  for  marijuana  to  be  a  gateway  to   <br />other,  more  serious  drugs—a  third  or  more  of  the   <br />respondents  either  disagreed  or  had  no  opinion  about   <br />whether  marijuana  had  any  impact.  Public  health   <br />officials  can  use  this  data  to  develop  public-­‐education   <br />campaigns  that  provide  helpful  information,  dispel   <br />myths  and  reduce  harm.               <br />   <br />     <br />How harmful to your health is marijuana if <br />you use it? (n=3,988) <br /> <br />8.A. - Page 83