Most of us don’t even think about the health effects of cannabis secondhand smoke — partly because there’s very little research being done on it.
Yet anti-smoking advocates say any smoke is bad for us and we need to regulate cannabis smoke just like tobacco smoke.
Dr. Matthew Springer was at a Paul McCartney concert a few years ago, when he had an epiphany that sent his career in a new direction.
Something in the air
It happened in the middle of the concert, when people around him started lighting up. A visible haze of pot smoke rose above the audience.
“Paul McCartney actually stopped between numbers and sniffed the air and said, ‘There’s something in the air — must be San Francisco!’” Springer says.
That’s when Springer started thinking: San Franciscans would never tolerate cigarette smoke like that anymore. Why were they OK
... read more at: http://kalw.org/post/secondhand-cannabis-smoke-bad-you