Lexington Police Lieutenant Scott Blakely says the central Kentucky community is home to a one and a half to two million dollar weekly drug habit.   While heroin-related overdose deaths are on a decline, the narcotics officer says crack cocaine use is on an uptick.  Blakely says cocaine and heroin sales take place all over Lexington.  "It is available from downtown to Heartland, from downtown to Beaumont.  With heroin, it was everywhere.  It's not just centered to downtown and neither is the cocaine and it never has been in Lexington," said Blakely.