As multitasking continues to rise, viewers are distracted from TV programming and advertising content while they are using another device.
Simultaneous usage of digital devices while watching TV -- at least once month -- will grow to nearly 85% of all Internet users this year from around 80% a year ago, according to eMarketer.
By 2018, this simultaneous usage is forecast to be nearly 92%.
Smartphone users will increase to 79% by 2018 from 68% this year, with tablet users rising to near 35% from 31% this year. Desktop/laptop activity will essentially remain the same -- 52.8% in two years from 52.1% this year.
In 2016, eMarketer says 182.9 million Americans are using the Internet while watching TV at least once a month -- and 146.9 million Americans use Internet-connected apps on their phone while they watch TV.
And there will be more distraction when it comes to which TV services are used as well. Cord-cutting is expected to hit 16% this year among all current pay TV customers who have traditional access to pay TV services. This will rise to 19% in two years.
This yea,r the U.S. will lose a net 1.3 million pay TV viewers, according to an eMarketer report, which came out in December 2015. Total pay TV viewers are expected to be 205.7 million this year, slipping to 199.6 in 2019.