Watch VoirFilms. A quarter of a million drug addicts —one of the most serious consequences of the Vietnam War. These addicts were the citizens of the South, and of Ho Chi Minh City, the former Saigon. Shot in 1981 by three Australian women, Changing the Needle was the first in-depth film to be made about Vietnam’s unique approach to drug rehabilitation at a time when few foreign film crews had access to Vietnam at all.