Smoking near babies has same effects as smoking while pregnant

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It's common knowledge that smoking near toddlers is bad, but it may be even worse than you think.

A Canadian study reveals that kids who were exposed to smoke early in childhood presented a wider body structure with a higher body mass index than other children.

SEE ALSO: Baby simulators aren't preventing teen pregnancy

The results are the same for babies of mothers who smoked during their pregnancy.

Researchers say the results may actually be underestimated because of parents who underreport the amount they smoke out of shame.

40% of children around the world are exposed to secondhand smoke in their homes.

Click through the gallery to see e-cigarettes being used in schools:

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Schools E-cigarettes
In this photo taken Tuesday, July 7, 2015, Will Braaten, 19, exhales vapor from an e-cigarette at the Vapor Spot, in Sacramento, Calif. As e-cigarettes rise in popularity, “vape shops” are popping up around the nation, places where customers can gather to inhale doses of nicotine through a flavored vapor solution. Industry officials say California is at the epicenter, with an estimated 1,400 retailers, operating largely without regulations in a Wild West atmosphere, but rules are imminent. (AP Photo/Rich Pedroncelli)
Jonathan Brower is the owner of Waldo Vapes in Kansas City, Mo., which sells some high-end vaping products. (David Pulliam/Kansas City Star/TNS via Getty Images)
SAN RAFAEL, CA - JANUARY 28: A customer smokes an E-Cigarette at Digita Ciggz on January 28, 2015 in San Rafael, California. The California Department of Public Health released a report today that calls E-Cigarettes a health threat and suggests that they should be regulated like regular cigarettes and tobacco products. (Photo by Justin Sullivan/Getty Images)
SAN RAFAEL, CA - JANUARY 28: Rhiannon Griffith-Bowman smokes an E-Cigarette at Digital Ciggz on January 28, 2015 in San Rafael, California. The California Department of Public Health released a report today that calls E-Cigarettes a health threat and suggests that they should be regulated like regular cigarettes and tobacco products. (Photo by Justin Sullivan/Getty Images)
SAN RAFAEL, CA - JANUARY 28: A customer smokes an E-Cigarette at Digita Ciggz on January 28, 2015 in San Rafael, California. The California Department of Public Health released a report today that calls E-Cigarettes a health threat and suggests that they should be regulated like regular cigarettes and tobacco products. (Photo by Justin Sullivan/Getty Images)
SAN RAFAEL, CA - JANUARY 28: A customer smokes an E-Cigarette at Digital Ciggz on January 28, 2015 in San Rafael, California. The California Department of Public Health released a report today that calls E-Cigarettes a health threat and suggests that they should be regulated like regular cigarettes and tobacco products. (Photo by Justin Sullivan/Getty Images)
SAN RAFAEL, CA - JANUARY 28: E-Cigarette vaporizer components are displayed at Digital Ciggz on January 28, 2015 in San Rafael, California. The California Department of Public Health released a report today that calls E-Cigarettes a health threat and suggests that they should be regulated like regular cigarettes and tobacco products. (Photo by Justin Sullivan/Getty Images)
TORONTO, ON - NOVEMBER 24: The Ontario government announces new prohibitions on smoking E-Cigarettes any place real cigarettes are banned. (David Cooper/Toronto Star via Getty Images)
Cliff Phillips, a 61-year-old retiree and former smoker, and his wife, Vali, enjoy electronic cigarettes at their home in Cuba, Ill., Tuesday, May 31, 2011. Electronic cigarettes like the one used by Phillips are at the middle of a social and legal debate over whether it's OK to "light up" in places where regular smokes are banned. E-cigarettes, which are gaining popularity and scrutiny worldwide, are plastic and metal devices that heat a liquid nicotine solution in a disposable cartridge, creating vapor that the "smoker" inhales. (AP Photo/Seth Perlman)
This Aug. 14, 2014 photo shows child-proof refill bottles of liquid nicotine at Salt Lake Vapors, in Salt Lake City. Poison control workers say that as the e-cigarette industry has boomed, the number of children exposed to the liquid nicotine that gives hand-held vaporizing gadgets their kick also is spiking. The American Association of Poison Control Centers reports that more than 2,700 people have called about a liquid nicotine exposure this year, up from a few hundred cases three years ago. (AP Photo/Rick Bowmer)
Daryl Cura demonstrates an e-cigarette at Vape store in Chicago, Wednesday, April 23, 2014. The federal government wants to ban sales of electronic cigarettes to minors and require approval for new products and health warning labels under regulations being proposed by the Food and Drug Administration. (AP Photo/Nam Y. Huh)
In this photo taken Thursday, July 16, 2015, Scot Taylor, left, manager of the Vapor Spot and customer Bruce Schillin, 32 exhale vapor from e-cigarettes at the e-cigarette store in Sacramento, Calif. As e-cigarettes rise in popularity, “vape shops” are popping up around the nation, places where customers can gather to inhale doses of nicotine through a flavored vapor solution. Industry officials say California is at the epicenter, with an estimated 1,400 retailers, operating largely without regulations in a Wild West atmosphere, but rules are imminent. (AP Photo/Rich Pedroncelli)
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