I'm 54 days off the cigs now by using eLiquid with and eCig and found it really easy to stop the cigs..
As far as I know eLiquids don't contain sugar as a sweetener because it clogs up the coil and wick in no time. Many, if not most juices contain sweetner in the form of: sucralose, stevia or ethyl maltol.
Just to add, I find that sucralose as an artificial sweetener especially clogs up the coils at any moderate percentage!
Also for anyone reading this just in case it's taken the wrong way- I'd advise
against starting vaping unless you're using it as an aid to quit smoking altogether or to replace smoking tobacco. We have to be careful enough about what we put into our bodies as it is and even a well studied drug such as nicotine can affect every individual differently.
Although there is no real long term evidence to support the notion that this habit is 'safe'- it is
drastically safer than smoking tobacco products, before diabetes even comes in play. I was told by my GP that the introduction of e-cigarettes as a smoking cessation aid to the NHS could be around the corner. They have already proven to be monumentally effective for quitting smoking; with up to 80,000 smoking related deaths a year caused by smoking this could be seen as a blessing to our national health.
I suspect many of the tabloid/sensationalist articles on the 'hazardous' effects of vaping could well be initiated by monetary input from tobacco industries who have been hit hardest by the emergence of vaping.
As for the long term, who knows? We do know however that nicotine is a well studied drug and is relatively benign alone (when not consuming it in the cigarette chemical cocktail and combusted with all of the other material). E-liquid in general contains propylene glycol and glycerol, both food safe.
Don't start smoking or vaping is my advice though.

Stay safe