Eniac was the first instance of what?

ENIAC (Electronic Numerical Integrator And Computer) was the first large-scale computer to run at electronic speed. Completed in 1945, it was also one of the earliest electronic computers made. This early computer was primarily designed to calculate artillery firing tables for the United States Army's Ballistic Research Laboratory. It was also able to solve a large class of numerical problems.

explanation:

allergens: overstimulate the nerve system

neurotics: attack nerve cells

mutagens: damage or otherwise alter dna sequence

generators: cause defects during growth and development  

carcinogens: cause unchecked cell growth

i hope you get the idea according to me these are the effects that happened.