Open your doors of perception and take a long toke of this week's mind-bending episode. With guest Jacob Hawley - comedian and host of BBC podcast, Jacob Hawley: On Drugs - we snort, sniff and soft-boil any substance we can in search of the World's Worst Narcotic. Barry hangs around the sewage pipes of Zambia, Ben feeds hallucinogenic lichen to goats and Jacob introduces us to the cutest-sounding drug popular among Noughties New Ravers. Plus we finally figure out what every character in Winnie The Pooh is smoking.

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