Pot may indeed lead to heroin use, rat study shows (Reuters)

NEW YORK (Reuters Health) - Teens who experiment with marijuana may be making themselves more vulnerable to heroin addiction later in life, if the findings from experiments with rats are any indication. "Cannabis has very long-term, enduring effects on the brain," Dr. Yasmin Hurd of the Mount Sinai School of Medicine in New York, the study's lead author, told Reuters Health in an interview. Whether or not trying marijuana is a 'gateway' to use of so-called harder drugs like heroin and cocaine has ...