Since e-cig's release, there are a growing number of studies used to prove whether the e-cig is good for human beings or not. Some studies claim that vaping device containing nicotine is harmful to the human body  as much as conventional cigs do. Some studies say that e-cigs are good for smokers relative to cigs as they cannot produce tar and other toxic substances. The scientific community has been divided about e-cig's effect. So before purchasing e-cigs, you should think twice.
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