Event planner and pro stoner Sam Kanter shares the dos and don'ts of edibles etiquette. The first holiday season approaches since Massachusetts residents have had recreational access to legal cannabis products, and the temptation might be strong to add the well-known appetite enhancer to your family feast. But before swapping out the traditional Thanksgiving pie or Christmas cookies for a big plate of pot brownies, heed this edibles etiquette advice from Sam Kanter, the event-planning…