Home / People / Peter GrinspoonDepression Risk Rises in Folks Who Use Both Marijuana & TobaccoPeter GrinspoonWed, Sep 13"The Achilles heel of this entire type of study is that correlation is not causation," said Dr. Peter Grinspoon, a cannabis specialist at Massachusetts General Hospital & Harvard Medical School. Depression Risk Rises if Use Both Marijuana & Tobacco https://t.co/8tOKhlWF3g6332Read More Discover Peter GrinspoonNewsCannabisPsychedelicsAddictionDispensaryHealthOpioidsScience