RE your comment on Phil's answer: There may be a legal difference between smuggler and trafficker. For example:
"That is why it is incredibly important for people to understand the nuances of law, such as the differences between drug trafficking and drug smuggling, which are typically used synonymously...Simply
moving drugs is smuggling, but if there is an element of selling the drugs, then it goes into trafficking territory."
https://www.coreycohen.com/blog/2017/12/differences-between-...Also, while I'm not going to say anything against (drug) runner, the definition in all major dictionaries does reference illegal import/export activities. As an example:
"someone who brings illegal drugs
from one country to another"
https://www.ldoceonline.com/dictionary/drug-runnerBy contrast, in real life:
https://www.bbc.com/news/av/uk-41727965/i-was-a-teenage-drug...The above is closer to what you want to say (though they sell the drugs) but has little to do with the dictionary definition.
In the end, I'm not sure people would care either way. How many of your viewers are going to be experts on the drug trade?
Best