One or two tins in a carry-on look more realistic
Just ask an ex-smoker
A minor may act as a decoy to assist with compliance checks, provided that prior written parental consent is obtained, the minor is under 21, the minor appears to a reasonably prudent seller to be of an age that would require a request for identification, the minor carries either his own identification showing the minor's correct date of birth or no identification, the minor presents the identification upon request, and the minor answers truthfully any questions concerning his age

2,4-Heptadienal, gamma-Heptalactone, Heptanoic Acid, 2-Heptanone, 3-Hepten-2-One, 2-Hepten-4-One, 4-Heptenal, trans -2-Heptenal, Heptyl Acetate, omega-6-Hexadecenlactone, gamma-Hexalactone, Hexanal, Hexanoic Acid, 2-Hexen-1-Ol,, 3-Hexen-1-Ol, cis-3-Hexen-1-Yl Acetate, 2-Hexenal, 3-Hexenoic Acid, trans-2-Hexenoic Acid, cis-3-Hexenyl Formate, Hexyl 2-Methylbutyrate, Hexyl Acetate, Hexyl Alcohol, Hexyl Phenylacetate, 1-Histidine, Honey, Hops Oil, Hydrolyzed Milk Solids, Hydrolyzed Plant Proteins, 5-Hydroxy-2,4-Decadienoic Acid delta- Lactone, 4-Hydroxy-2,5-Dimethyl-3(2H)-Furanone, 2-Hydroxy-3,5,5-Trimethyl-2-Cyclohexen-1-One, 4-Hydroxy -3-Pentenoic Acid Lactone, 2-Hydroxy-4-Methylbenzaldehyde, 4-Hydroxybutanoic Acid Lactone, Hydroxycitronellal, 6-Hydroxydihydrotheaspirane, 4-(para-Hydroxyphenyl)-2-Butanone, Hyssop Oil

Additionally, controlling illicit tobacco could become easier: the government could simply penalise illegal traders by comparing the trading price and profit margin against its benchmarks.