Sorry for slightly hijacking what you were getting at in this inquiry, but feel it is resolved both here and on Talk Page.
I'm reading other editors (namely DJ) who says, "If one does not source every single statement someone will come along and tag it with [citation needed] in no time." And this in regards to QG's statement of, "Personally I prefer no unsourced text even if true."
So, I looked at the source material for the assertion on main article page that reads, "The benefits and health risks of electronic cigarettes are uncertain." And I'm not finding that assertion in the source material. In fact, the source material exactly says:
Citation 14 (from 2015): "Electronic cigarettes (e-cigarettes) have substantially increased in popularity. Clear evidence about the safety of e-cigarettes is lacking, and laboratory experiments and case reports suggest these products may be associated with potential adverse health consequences. The effectiveness of e-cigarettes for smoking cessation is modest and appears to be comparable to the nicotine patch combined with minimal behavioral support. Although a role for e-cigarettes in the treatment of tobacco dependence may emerge in the future, the potential risk of e-cigarettes outweighs their known benefit as a recommended tobacco treatment strategy by clinicians. Patients should be counseled on the known efficacy and potential risks of e-cigarettes."
Citation 15 (from 2014): "Clinicians are advised to be aware that the use of e-cigarettes, especially among cigarette smokers, is growing rapidly. These devices are unregulated, of unknown safety, and of uncertain benefit in quitting smoking."
Both of these are with regards to quitting smoking and the effectiveness. And not about the overall benefits and health risks.
I'm wondering if you,
@Wallace_Frampton wish to attack this aspect as I think it could be way to greatly shorten the lede.
First is that the assertion is made, via the full stop (aka period) as if the assertion applies to all aspects of eCigs and benefits / health risks, when clearly the source material is not stating that. Though the paragraph that follows is about smoking cessation, the assertion that is "lead" for this paragraph is falsely being attributed to the source material. It would need to say, "With regards to smoking cessation, the benefits and health risks of electronic cigarettes are uncertain."
Even that would temper things in the lede, as it is noting a specific qualification for that assertion rather than implying, as it currently does, like no one anywhere has reported on the benefits and health risks.
So for me, that would be where I'd draw line in the sand, but would push further, and go for idea that smoking cessation as it relates to eCigs ought not to be in the lede. I'm kinda thinking I've made that point already on Talk Page awhile back, but this idea of source material helps reintroduce that. I think I brought up that the 2009-10 U.S. court decision restricts vaping industry from making claims of their product as smoking cessation product, unless it is registered with FDA as a drug. So, industry decided to avoid that whole label, choosing the recreational path, instead of the medical path. And I think when I brought this up on Talk Page before, the counterpoint to this is that Wikipedia is written for international audiences, and not just those in the U.S.
And yet, that counterpoint doesn't explain why the lede needs to bring up smoking cessation. IMO, that ought to be left out of the lead, and ideally put into another forked off topic article, or at least put into subsection of main topic article.
Literally, every assertion in the second paragraph of the lede is serving a political agenda. And no assertion clarifies what an eCig actually is, but instead gets into "how might society use this, if society has an agenda in place that eCigs might aid in."
Just about everything in the lede after the first paragraph is in that political spin mode, and so just tackling the one sentence is not likely to convince all editors to abandon that course, but I think if sourced material is so critical, it would be picking away at opposition's need to politicize the lede of the Wikipedia main topic article.