Very safe, you couldn't get a flame out of it if you tried, after the following starting procedure. Just put the appropriate amount of Lighter Fluid in the mainbody, a drop or two on the 'element', light the 'element' and when the flame goes out, put the lid on and insert whole into little bag. There are no flames after you do that, just a slightly glowing element. On a cold night I usually use 4 of them!
Charles
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