Here is the link to the proposed ballot measure, which was somehow not linked to by ANY of the sources covering this story.
https://sfbos.org/sites/default/files/LI031919.pdf
Looks to be two separate measures, one banning all nicotine products from being sold, manufactured, or distributed from City property, the 2nd banning all Non-FDA approved products (vapes) from the entire city: 190311 & 190312, respectively.