President Obama and rapper Macklemore
Media playback is unsupported on your device
Video

Rapper Macklemore and President Obama warn of drug dangers

President Obama was joined by rapper Macklemore for his weekly address - in an effort to raise awareness about the perils of drug addiction.

The president described drug abuse as "a public health problem" and said that more needed to be done to treat addicts "before it's too late".

Go to next video: Do 'smart drugs' really work?