Workers distracted by email and phone calls suffer a fall in IQ more than twice that found in marijuana smokers, new research has claimed.
The study for computing firm Hewlett Packard warned of a rise in "infomania", with people becoming addicted to email and text messages.
Researchers found 62% of people checked work messages at home or on holiday.
The firm said new technology can help productivity, but users must learn to switch computers and phones off.
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