The medium on which people spend most time viewing is: television. smartphone. desktop computer. tablet. smartphone and tablet combined.

Explanation:

The correct answer is the television.

According to research, an average American adult spend almost 5 hours and 4 minutes watching the television every day. While, the 4 hours 30 minutes is spent on live broadcast television. One must know how to limit watching the television closely and too much, health experts has said that it could cause eye problems, or may also give you a bad headache.

no questions on whether they are allowed that right

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.