Answer:
The smallpox vaccine was officially discontinued in the year 1980.
Step-by-step explanation:
This decision was made by the World Health Organization (WHO) after smallpox was declared eradicated from the world. Smallpox was a highly contagious and deadly disease caused by the variola virus. The vaccine Edward Jenner developed in the late 18th century was instrumental in controlling and eventually eliminating smallpox globally. The successful eradication of smallpox is a major milestone in public health and vaccination efforts.