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They do have a smell but I'm sure there are worse smells coming from your shanty
I never liked them because they smelled. Tho only people claiming they didn't smell were people who couldn't smell anything else either. In fact, come to think of it, most were also heavy smokers.
Most also had a hole so you could light a cigarette off the burner.
I tried the link and I was taken to the page with a dog on it and the caption read, "sorry we couldn't find the page".
they sink
I have a couple of the old Jon-e hand warmers that I used to use. One stunk bad and the other didn't stink much at all, figured it was a bad wick on the one that stunk. My son got me a zippo hand warmer for Christmas one year and it work good and didn't stink. But, those warmers aren't worth the time filling and spilling and messing with the fuel. I have a nice collection of zippo lighters I've used over the years also... that's why I started using a bic, the lighter fuel is a pain in the butt.
As anything, it's electronic so i've attempted to keep dry hands on it.