In 1946, a new advertising campaign appeared in magazines with a
picture of a doctor in a lab coat holding a cigarette and the slogan, “More
doctors smoke Camels than any other cigarette.” No, this wasn’t a spoof. Back
then, doctors were not aware that smoking could cause cancer, heart disease and
In a similar vein, some researchers and consumers are now asking whether
wearable computers will be considered harmful in several decades’ time.
We have long suspected that cellphones, which give off low levels of radiation,
could lead to brain tumors, cancer, disturbed blood rhythms and other health
problems, if held too close to the body for extended periods.
Yet here we are in 2015, with companies like Apple and Samsung encouraging us to
buy gadgets that we should attach to our bodies all day long.
While there is no definitive research on the health effects of wearable
computers (the Apple Watch isn’t even on store shelves yet), we can hypothesize
a bit from existing research on cellphone radiation.
The most definitive and arguably unbiased results in this area come from the
International Agency for Research on Cancer, a panel within the World Health
Organization that consisted of 31 scientists from 14 countries.
After dissecting dozens of peer-reviewed studies on cellphone safety, the panel
concluded in 2011 that cellphones were “possibly carcinogenic,” and that the
devices could be as harmful as certain dry cleaning chemicals and pesticides.
(Note that the group hedged their findings with the word “possibly.”)
The W.H.O. panel concluded that the farther away a device is from one’s head,
the less harmful — so texting or surfing the Web will not be as dangerous as
making calls, with a cellphone inches from the brain. (This is why there were
serious concerns about Google Glass when it was first announced, and why we’ve
been told to use hands-free devices when talking on cellphones.)
A longitudinal study by Dr. Lennart Hardell, a professor of oncology and cancer
epidemiology at the University Hospital in Orebro, Sweden, concluded that
talking on a mobile or cordless phone for extended periods could triple the risk
of a certain kind of brain cancer.
There is, of course, antithetical research. But some of this was partly funded
by cellphone companies or trade groups.
One example is the international Interphone study, which was published in 2010,
and did not find strong links between mobile phones and an increased risk of
Another study in the British Medical Journal, which measured cellphone
subscription data, rather than actual use, said there was no proof of increased
cancer. Yet even here, the Danish team behind the report did acknowledge that a
“small to moderate increase” in cancer risk among heavy cellphone users could
not be ruled out.
But what does all this research tell the Apple faithful who want to rush out and
buy an Apple Watch, or the Google and Windows fanatics who are eager to own an
Joseph Mercola, a physician who focuses on alternative medicine and has written
extensively about the potential harmful effects of cellphones on the human body,
said that as long as a wearable does not have a 3G connection built into it, the
harmful effects are minimal, if any.
“The radiation really comes from the 3G connection on a cellphone, so devices
like the Jawbone Up and Apple Watch should be O.K.,” Dr. Mercola said in a phone
interview. “But if you’re buying a watch with a cellular chip built in, then
you’ve got a cellphone attached to your wrist.” And that, he said, is a bad
(The Apple Watch uses Bluetooth and Wi-Fi to receive data, and researchers say
there is no proven harm from those frequencies on the human body. Wearables with
3G or 4G connections built in, including the Samsung Gear S, could be more
harmful, though that has not been proved. Apple declined to comment for this
article, and Samsung could not be reached for comment.)
Researchers have also raised concerns about having powerful batteries so close
to the body for extended periods of time. Some reports over the last several
decades have questioned whether being too close to power lines could cause
leukemia (though other research has also negated this).
So what should consumers do? Perhaps we can look at how researchers themselves
handle their smartphones.
While Dr. Mercola is a vocal proponent of cellphone safety, he told me to call
him on his cell when I emailed about an interview. When I asked him whether he
was being hypocritical, he replied that technology is a fact of life, and he
uses it with caution. As an example, he said he was using a Bluetooth headset
during our call.
In the same respect, people who are concerned about the possible side effects of
a smartwatch should avoid placing it close to their brain (besides, it looks a
But there are some people who may be more vulnerable to the dangers of these
While researchers debate about how harmful cellphones and wearable computers
actually are, most agree that children should exercise caution.
In an email, Dr. Hardell sent me research illustrating that a child’s skull is
thinner and smaller than an adult’s, which means that their brain tissues are
more exposed to certain types of radiation, specifically the kind that emanates
from a cellphone.
Children should limit how much time they spend talking on a cellphone, doctors
say. And if they have a wearable device, they should take it off at night, so it
does not end up under their pillow, near their brains. Doctors also warn that
women who are pregnant should be extra careful with all of these technologies.
But what about adults? After researching this column, talking to experts and
poring over dozens of scientific papers, I have realized the dangers of
cellphones when use for extended periods, and as a result I have stopped holding
my phone next to my head and instead use a headset during phone calls.
That being said, when it comes to wearable computers, I’ll still buy the Apple
Watch, but I won’t let it go anywhere near my head. And I definitely won’t let
any children I know play with it for extended periods of time.