大象传媒

Lewis is a young occasional cocaine user from the Midlands in the UK.

The 大象传媒 set up a video chat between him and two Colombian men who harvest coca leaves and turn them into cocaine using ingredients such as petrol.

One farmer told Lewis: "I don't want to take it because I know what is in it."

The full Our World documentary, Colombia: The New Cocaine War, can be watched at various times this weekend on 大象传媒 World News.

If you are affected by drug addiction, information and support is available from 大象传媒 Action Line.