They are pretty safe!!!
Don't leave them in direct sun light and don't throw them in the fire.
I'd also imagine not to drop them off of really high things on to concrete. I've dropped them from the back of the suburban on grass, only like 6', and no issues.
To elaborate on SnowBlinds talk about white gas Vs. Propane
If you are using a white gas stove that takes unpressurized gas like this
for a stove that looks something like this
You do need to be a little more cautious with pressure changes. When you go from low altitude to high altitude, you will see the bottle swell a little bit. But it is made of flexible metal, so if figure its not a huge deal. Just burp the can.
The white gas stoves can be a bitch to light! And if you run out of gas while cooking they can be a bitch to refuel.
But I have never had an issue with my gas stove eventually lighting even at 12,000 ft. Where as some of the pressurized propane and butane stoves have some issue at high altitudes.
I have one of these old white gas stoves that is about 25 years old, and it still works, some times it is finicky. But I'm going to switch to the propane models.
Everything runs off those little green propane cans now. Lanterns, 1 burners, stoves, heaters, and even Bug Zapers! Buy a case of those cans and call it good!