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E-cigarettes pose a tiny percent of the risk of cigarette smoking, just 1 percent to 5 percent according to authorities like the United Kingdom government. That could mean the difference between life and death for the half million Americans and 7 million people worldwide who die of smoking-related illness every year. Even if it turns out that e-cigarettes convey small long-term risks, those products should remain an option for smokers who haven’t been able to kick their more deadly habit and haven’t had luck with prescription drugs, patches, gums or lozenges.