Email addiction is growing, with no cure in sight, according to online marketing company eROI's September Email Addiction Survey.

Some 61 percent of survey respondents said they continue to check email even while on vacation, and 56 percent reported a high level of anxiety if they can't access email. Two out of three people surveyed said they read email every day of the week, 90 percent read email six days a week and 75 percent respond to emails six days a week.

Two-thirds of respondents expect to receive a response from their email the same day. More than 50 percent can't wake up or go to bed without once checking email.

Most resondents - 55 percent - admit that email takes up more time in their life than it should.