Pot-infused edibles are trickling onto shelves at marijuana stores, and more products are coming, despite a shortage of legal pot and new last-minute state regulations. Entrepreneurs have bemoaned the slow pace, but regulators are being cautious about public health. Statewide pot-supply shortages slowed edibles’ arrival, but manufacturers also were stifled, and frustrated, by emergency regulations from the state Liquor Control Board (LCB), which has taken a cautious approach to opening the marketplace. So far, the LCB has given its blessing to products — including chocolate bars, sodas and energy shots — from three new businesses. Nine more kitchens have been...