Being a hiker and backpacker, I would consider the many stoves produced for that purpose, like the MSR Pocket Rocket 2, weighing a mere 3 oz, and utilizing isobutane canisters of varying sizes readily available in outdoor stores. There are many other choices available, like Trangia alcohol stoves and their homemade equivalents. For top of the line versatility, consider the MSR Whisperlite Universal backpacking stove , a bit more costly., but burns many different fuels.

These are all quite light, and readily portable, unlike the Coleman and its ilk (of which I have two -- quite useful when weight is not a concern).

CO is a concern with any open flame. Use outdoors or with really good ventilation.