I did not know this and was reading about it. I am not surprised. I smoked Marlboros for years and they were highly addictive. Juul has adopted a similar business model of proprietary highly addictive blends/formulas.
Altria even let go of 2 of the e cig companies Mark Ten and Greensmoke and they now own about 35% of Juul and invested over 12 billion - their biggest investment in the history of Altria.
You know they are going to be pushing Juul to the masses bigtime!