"I hate people who think it's clever to take drugs... like custom officers"

This quote by Jack Dee is a criticism of people who think it is smart to take drugs, especially those in positions of authority such as custom officers. He is indicating that these people are not just careless, but also silly for thinking that taking drugs is a smart thing to do. He is likewise suggesting that these individuals are not setting a good example for others, which their actions are not just dangerous but likewise unlawful.

The quote suggests that Jack Dee is strongly versus using drugs, and that he thinks that those in positions of authority need to be held to a higher standard. He is suggesting that custom officers must be setting an example for others, and that taking drugs is not only careless but likewise absurd. He is also indicating that those who think it is clever to take drugs are not just putting themselves in danger, but also setting a bad example for others.