The TP is a wick and wont burn unless the fuel is gone then it will smoke a lot. This works great and it is safe if you have some air moving in your shelter in my truck I would use it in bursts but ensure some air change over. Spend the 2-3 dollars and try it and if its not for you cool. The best application is the shelter I have or the duck blind. As for the truck well if you know what -20 degrees feels like stuck in a car you'll fine a back up soarse of heat. Look up fondue fuel and you can see the stuff is stable and safe , if you don't drink it. Its been over 20 years since I took organic chemistry but lets try...
2 CH3OH + 3 O2 = Heat + 2 CO2 + 4 H2O
Several things on that!
1. CO2 is heavier than air, and will replace oxygen if it cannot escape out of a confined area, like on the floor of a well-sealed tent (at the bottom - think drifting snow sealing off bottom of tent etc) or caravan/room. You will then die if you're in that enclosed space!
2. Ch3oh s methyl alcohol. Meths is predominantly ethyl alcohol - C2H5OH, although the combustion process is fundamentally the same. However, Methyly alcohol is actually very poisonous - one needs to treat it with great care.
3. That formula only works if you have complete combustion of the alcohol. For incomplete combustion, it looks significantly different (I'll use ethyl alcohol) C2H5OH + 4O2 => 4CO + 6H2O which is Carbon monoxide and water. Which is a competely different ball-game! Carbon Monoxide has a greater affinity for haemoglobin than oxygen, so sticks to the red blood cells, which can then no longer carry oxygen around the body as its "oxygen carrier" positions are full of CO. And you die.