Šmuilas Kamajus was born on 6 November 1920 in Vasilishky, Novohrudak County (Belarus), but immediately after his birth his parents Mauša and Rivka returned to Mauša’s native Vilnius and settled on 9 Subačiaus Street. After finishing primary school in 1939, Kamajus was admitted to the coeducational gymnasium Oświata (Enlightenment), which he finished in 1938. The following year, he became a student in the Chemistry Department of the Faculty of Mathematics and Natural Sciences of the Vilnius Stephen Bathory University. However, he did not have enough money to continue his studies in Kaunas after the closing of the Stephen Bathory University in 1939, and so he suspended them. But the next year, when the Lithuanian-administered Vilnius University began to function, Kamajus returned to the university to continue his chemistry studies. In 1941, he requested permission to go to Vasilishky to pick up some of his things, but apparently was denied. On 19 September 1941, Šmuilas Kamajus was expelled from the Department of Chemistry of the Faculty of Mathematics and Natural Sciences of Vilnius University on the basis of the Order of 17 September 1941 of the Higher Education Department of the Board of Education, which was subordinate to the Nazis. He was killed in Vilnius.