This case study is interesting. If RFMK is selling their ecigs to mmj distributors, then clearly no foreign registry is needed.
For example, in Le Vecke v. GriesedieckWestern Western Brewery Co., 233 F.2d 772 (9th Cir. 1956), a foreign brewery was deemed not to be transacting intrastate business in California despite shipping a considerable amount of its product to local distributors for distribution in California and had its officers make several sales promotion trips there. Despite these activities, the holding was based on the fact that the brewery did not maintain an office or place of business in California, did now own inventory or maintain a warehouse there, had no salesmen or employees there,and did not maintain a bank account, lend money, or ship on consignment to California.