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Until just a few years ago, electronic cigarettes were relatively obscure. Now, they form a $1.7 billion industry that is steadily growing. But the e-cigarette has also opened up a divide within the anti-smoking movement: is it a promising harm reduction tool or simply a gateway to smoking tobacco cigarettes?
Dr Michael Siegel, a Professor of Community Health Sciences at Boston University.
Rep. Jeffrey Sanchez, a Democrat from Jamaica Plain and co-chairman of the legislature's Public Health Committee.
This segment aired on February 26, 2014.