Possible Clues:

• Drug baron finally getting lorry outside Columbia
• Drug badly affected actor in clubs
• On Arctic manoeuvres, drug supplied
• Drug company invested in new means of transport
• Losing head, Scot in car transported drug
• (Drug) producing torpor
• A drug causing sleep or drowsiness
• Unexpected contraction not ruled out due to drug
• Drug converted into crack, mostly
• Opium, e.g.