The signatures had been collected via a website, saveecigs.com, which proclaimed itself the voice of the “forgotten millions in this debate” — people who had taken up e-cigarettes to stop smoking, and their grateful families.BRUSSELS — Facing a decision on whether to impose tight restrictions on a booming market for electronic cigarettes, members of the European Parliament received a pleading letter in September that was signed by thousands of former smokers worried that “the positive story of e-cigarettes may be about to come to an abrupt halt.”/.../