“Can I mail cannabis I purchased from CNB to another provance?”

Cannabis is allowed to be transported between provinces. However, under the NB Cannabis Control Act, it is illegal for anyone that is not an authorized service provider to "distribute or sell cannabis".  Thus, there is a possibility that sending by mail may be deemed to be distributing, depending upon who the recipient is that will receive the product.  It is best to consult the act yourself, and perhaps legal counsel, if intending to ship cannabis on your own.