Chemists at some of the biggest legal-weed companies are after an elusive prize; a predictable, reliable product. The retail showroom of INSA, a farm-to-bong cannabis company in western Massachusetts, is a clean industrial space on the first floor of a four-story brick building in the old mill town Easthampton. When I visited recently, before the coronavirus shut down recreational sales and forbade crowds, the crew of eight behind the glass display cases looked a lot…

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