I smoke slightly more with ecigs than I did with cigarettes and I use the vape throughout the day. But whenever I have a real cigarette now I get a head rush and feel the nicotine quite strong, which is the feeling I would previously get with the first cigarette after the numerous times I quit smoking and started again. Clearly I'm using far less nicotine with e-cigarettes, which surprised me because I didn't notice any side effects (additional "niccing") when I switched to vaping last yr.

So even if I smoke 30% more than I used to I'm probably consuming significantly less harmful chemicals in the end, including nicotine. Which means it will probably be easier to quit vaping than cigarettes, especially as I could taper the nicotine percentage from 6mg -> 0mg over a period of time without adjusting behaviour.

At 6mg -> 0mg I wouldn't say nicotine is a harmful chemical. It's a stimulant.

I don't think the debate is that nicotine is harmful in such quantities, but it's a terribly addictive stimulant generally consumed with varyingly harmful chemicals, so easing it out to zero helps in quitting inhaling those chemicals altogether.

Apart from the obvious bad manners implied by blowing huge clouds of smoke in a space where people are tightly packed, as in a queue; what problem do you have with e-smoke exactly? The smell?

This is literally stuff that's been inside a person's body being ejected out into my face. Now, I kinda agree that everyone is doing this constantly by simply breathing, but I don't really smell other people's exhaled CO2 so I'm ok with it. If it has odor and is visible, I WILL find it VERY rude and disturbing, to say the least.

The smell is often quite overpowering. I think "cloying" is the word; sometimes I feel like my airways are trying to close up.

I also don't know what's in the smoke. It might be harmless, might be absolutely awful for you. Doesn't help that my friends have used the excuse "it's just vapor".

excuse?

With a smell allergy, I've had e-cigs (and perfumes, which I lump in the same category) near me induce everything from coughing and sneezing fits to migraines and vomiting.

I knew a friend with a much, much worse smell allergy where a smell of the right color dye would cause seizures and possibly kill them.

Whoa, I'm not alone! I can't handle most perfumes or scents (in addition to a number of things). Nowhere near as bad as your friend, but I can get to the point where breathing gets hard.

I also find people's breath smelly on public transport. The reason is not just cigarettes but bad oral hygiene in general. Not sure what to do about it though...

On the other hand I hardly ever felt any vapour smell from e-cigarettes.

Also... Smoke is a mixture of gas and solid materials, while vapour is a mixture of gas and liquid.

I think using precise terms in a debate brings extra clarity into it, so instead of inventing poetic proxy terms, like e-smoke, let's just use the more commonly understood word "vapour" instead.