It's unclear whether or not they help people quit real cigarettes.
The May 2015 issue is here
Babies' genomes hold clues that can save their lives, but that same information could be used in far less noble ways. Where should we draw the line?
And which gum gives you the sweetest-smelling breath?
Here's the January 2015 issue of Popular Science, hot off the presses
Our editors scrounged up some truly bizarre facts.
Reefer madness! Pot causes psychosis! Except maybe not.
Sports: a soccer ball with improved aerodynamics
Supplying energy to homes using only the motion of the ocean
Multiple studies confirm red-light cameras do more harm than help. So why are they still so prevalent?
Cancer research gets a major boost from an innovative new center
Researchers prove gloomy shoppers are less likely to keep it in check
Ask the experts at Popular Science
Cows conform to electric fields, insects decrease with increasing radiation
The most explicit look yet at the impact that wiped out more than half of all life on earth
Keeping wildlife baby-free is a hazardous business