E-cigarettes appear to be effective when used by smokers as an aid to quitting smoking.
Links:
[1] http://admin.indiaenvironmentportal.org.in/news/e-cigarette-ban-wipes-out-less-harmful-alternative-smokers-experts
[2] http://admin.indiaenvironmentportal.org.in/category/newspaper/indian-express-new-delhi
[3] http://admin.indiaenvironmentportal.org.in/category/thesaurus/smoking
[4] http://admin.indiaenvironmentportal.org.in/category/thesaurus/health-effects
[5] http://admin.indiaenvironmentportal.org.in/category/thesaurus/tobacco
[6] http://admin.indiaenvironmentportal.org.in/category/thesaurus/european-union-eu
[7] http://admin.indiaenvironmentportal.org.in/category/thesaurus/health