Serious question, are gasses from li-ion dangerous

I accidentally punctured some pouch li-ion batteries in a laptop pack and ever since they have given off a smell that I can't describe. they are pretty much dead but I don't know how to separate them from the other packs without doing more damage. Should I be worried about the gasses they are giving off?

There's some info here: http://learningrc.com/puffed-lipos/ that suggests oxygen, CO2, and carbon monoxide, and I saw propylene and ethylene in another search from decomposition of the electrolyte. Basically nothing too toxic but nothing you want to leave around either, I would ventilate the area and make sure the vented battery is away from ignition sources, safely discharge and dispose of it. Not worth trying to save any nearby pouch cells in the pack.

Yeah exactly, it smells bad and I would say the risk of a fire is much bigger than the risk of intoxication. Just make sure to ventilate the room to get the bad smell out and make sure to get rid of the damaged battery. Don't try to get the other pouches out if you think you will do further damage. LiPo cells from laptops aren't worth keeping anyway. They are small and weirdly shaped and you often don't get enough of the same type to do something useful with them. And if you do get enough you can afford to throw these away and not run the risk of setting the battery on fire.

Thanks for the prompt answer. That's some good information.