When a proposal for a new marijuana store in Faneuil Hall came before the Boston Cannabis Board last month, city regulators hesitated, noting it would be the seventh pot retailer within a half-mile to win a local license. They wondered, how many pot shops is too many? For answers, officials in Mayor Michelle Wu’s administration say they will launch a study of other US cities … [Read more...] about No easy answers as Boston officials ask: How many marijuana stores is too many?