First: Remember that NO fire is completely smoke free. Also that the aroma of fire itself will carry very long distances, not just the aroma of food, but the fire gas emissions themselves.
If you have the option, a propane/butane stove is much less obvious and detectable. But you may not have that option...
That being said, there are times when you Must have an open fire, either for warmth or food preparation.
These are some basic techniques, which need to be practiced now, while you can do so safely.
https://thepreppingguide.com/survival-fire/Finally, there are times when open flame is NOT wise. So have a backup option such as MRE heating pouches and Hand Warmers.
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