Regarding face-to-face sales this is what the FSPTCA says...
(4) Remote sales.----
(A) In general.--The Secretary shall--
(i) within 18 months after the date of enactment of the Family Smoking Prevention and tobacco Control Act,
promulgate regulations regarding the sale and distribution of tobacco products that occur through means other than a
direct, face-to-face exchange between a retailer and a consumer in order to prevent the sale and distribution of tobacco
products to individuals who have not attained the minimum age established by applicable law for the purchase of such
products, including requirements for age verification;.
