Pennsylvania medical cannabis vape recall leaves patients stranded

A widespread recall of cannabis concentrates sold for vaping at medical cannabis dispensaries in the US state of Pennsylvania has left patients with more questions than answers about who to trust.

The Pennsylvania Department of Health (DOH) Office for Medical Marijuana issued the recall in February, questioning the safety of 670 products. A local newspaper estimated the recall to affect $12m worth of products, though the paper did not explain how it reached that figure.