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This change is partly because of new laws: Shops can only sell tobacco to adults over 18 (used to be 16) The power to stop shopkeepers from selling tobacco at all if they keep selling it to children Not allowing cigarettes to be on display in shops Cigarettes only being sold in plain packets

Dietary N-nitroso compounds and risk of colorectal cancer: a case-control study in Newfoundland and Labrador and Ontario, Canada

"The other piece that's out there that we don't have a good picture on yet is the e-cigarette part," Ediger said

Furthermore, the chance of developing cancer increases each time someone is exposed to carcinogens (e.g., each time a cigarette is smoked, or smokeless tobacco is used)