More than likely they would have to sell the e-liquid and flavorings separate from each other and the consumer would have to combine them. That would be the only way I could see it happening.
This could get interesting, It may be a ways out but the landscape is changing. It's strange that they(FDA) is so concerned about nicotine (Tobaco) products, yet I can get 1000ml of 100mg/ml Nic juice sent to my house in 5 days with nothing but a credit card.
Thanks,
Jeff~