Drug smuggling in Saudi Arabia could encompass literally anything. Drug laws are harsh, such that anything deemed a drug, in any quantity, is an offense bringing arrest or even execution. According to the State Department:

“Penalties for the import, manufacture, possession, and consumption of alcohol or illegal drugs in Saudi Arabia are severe. Convicted offenders can expect long jail sentences, heavy fines, public floggings, and/or deportation. The penalty for drug trafficking in Saudi Arabia is death, and Saudi officials make no exceptions. Customs inspections at ports of entry are thorough. The U.S. Embassy and Consulates General have no standing in Saudi courts to obtain leniency for a U.S. citizen convicted of alcohol or drug offenses”