Researchers found that e-cigarettes operated at high voltages produce vapor with large amounts of formaldehyde-containing chemical compounds.

This could pose a risk to users who increase the voltage on their e-cigarette to increase the delivery of vaporized nicotine, said study co-author James Pankow, a professor of chemistry and civil and environmental engineering at Portland State University in Oregon.

“We've found there is a hidden form of formaldehyde in e-cigarette vapor that has not typically been measured. It's a chemical that contains formaldehyde in it, and that formaldehyde can be released after inhalation,” Pankow said. “People shouldn't assume these e-cigarettes are completely safe.”

The findings appear in a letter published Jan. 22 in the New England Journal of Medicine.

Health experts have long known that formaldehyde and other toxic chemicals are present in cigarette smoke. Initially, e-cigarettes were hoped to be without such dangers because they lack fire to cause combustion and release toxic chemicals, a Portland State news release said.

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Greece‘s flirtation with an exit from the euro in 2011 and two cliffhanger elections in 2012 prompted the darkest days of the debt crisis, halted only by the European Central Bank‘s pledge to save the currency come what may.

Now, with the collapse of another Greek government, Europe’s leaders, its more vulnerable economies and financial markets are better prepared. While euro in-or-out threats will echo through the Greek election campaign, the spillover across Europe this time is likely to be contained.

“We’re looking at a Greece problem — the euro crisis is over,” Holger Schmieding, chief economist at Berenberg Bank inLondon, said by phone. “The euro crisis was all about contagion risk. I do not expect markets to seriously contest the contagion defenses of Europe.”

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A FINANCIAL crash in Russia; falling oil prices and a strong dollar; a new gold rush in Silicon Valley and a resurgent American economy; weakness in Germany and Japan; tumbling currencies in emerging markets from Brazil to Indonesia; an embattled Democrat in the White House. Is that a forecast of the world in 2015 or a portrait of the late 1990s?  

Recent economic history has been so dominated by the credit crunch of 2008-09 that it is easy to forget what happened in the decades before. But looking back 15 years or so is instructive—in terms of both what to do and what to avoid.

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Transparency International has published its 2014 Corruption Perceptions Index (CPI), which ranked 175 countries and territories based on how corrupt their administrative and political institutions are perceived to be on a scale from 0 (highly corrupt) to a 100 (very clean).

Compiled from a combination of surveys and assessments of “the abuse of entrusted power for private gain,” the CPI is the most widely used indicator of corruption worldwide.

Here are the 17 most corrupt countries, according to the index:

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