Electronic cigarettes should not be subject to the same regulation as other products that contain nicotine. Recent studies indicate that electronic cigarettes help people quit smoking by providing nicotine without the harmful tar and additive chemicals. Although electronic cigarettes also contain their own additives, they are much less harmful in the short-term than traditional cigarettes. People who smoke electronic cigarettes are ten times less likely to die from cancer than smokers of traditional cigarettes. Which one of the following most weakens the argument? ['The current regulations are designed to prevent children from using nicotine.', 'The recent studies are not conclusive.', 'The additives in electronic cigarettes have not been tested as thoroughly as those in traditional cigarettes.', 'More smokers die from heart disease than cancer.']