Collocations for smuggling - noun

illegal
cigarette, cocaine, diamond, drug, heroin, etc.
alien (AmE), human (esp. AmE), people (esp. BrE)
They have been charged with people/alien smuggling.

nuclear
policies to reduce the threat of nuclear smuggling

attempt
gang (esp. BrE), operation, racket (esp. BrE), ring
The two sailors are caught up in a diamond-smuggling racket.

route

smuggling of
the smuggling of narcotics into the country