Four months since lawful sales of recreational-use marijuana began in Maine, the industry is blossoming — and some of the newest sprouts are rooted outside the state. Maine legalized cannabis for medical uses in 1999, and then authorized its recreational use by adults in 2016. But plans for a legitimate, open marketplace in marijuana stalled for several years until going live in October 2020. Starting last summer, there was a land-rush grab for licenses needed by cannabis-related businesses to operate, and once they did, sales of marijuana soared. Recreational purchases of pot products in M...