Oh, that’s a good point.

This means that if there’s a restriction on something such as beer and cigarettes, you can legally trade them as long as you follow the rules. That wouldn’t be trafficking.

However, if you’re trying to cross the border with an absurd quantity of cigarettes hidden inside the chassis of your lorry, that could be considered cigarette trafficking.

If you hide heroin in there instead, it’s always drug trafficking, no matter what.

On the other hand, if you’re working for the East India Company and you’re shipping opium to China in the 1800s, it’s perfectly legal according to the Brits. The Chinese would have probably called that drug trafficking though.