By AMANDA GARDNER DAILY NEWS STAFF WRITER Tuesday, March 20th 2001, 2:20AM Thanks to a South Bronx doctor, the same techniques that help drug addicts in New York are aiding relief workers in Gujarat, the earthquake-ravaged region of western India. Years ago, Dr. Michael Smith, head of the recovery center at Lincoln Hospital and a pioneer in using acupuncture to treat addiction in the U.S., helped set up an acupuncture program for the Caring Foundation... Recently, Smith was back in New Delhi training more substance abuse workers when Suneel Vatsyayan, director of the foundation, asked him to meet with relief workers in Ahmedabad, the state capital of Gujarat, where thousands were killed Jan. 26. The devastation has been too much even for seasoned caregivers to handle. One 18-year-old girl insists that her last name is Bhukamp, which means "earthquake" in the local language. No one knows who she is or where she's from. One man suffers recurring headac...