If not vented, I believe it may be..... I know for sure BBQ's are dangerous no matter what.
you are right.
In the winter, woodstoves are the way to go for cooking, if you get a model you can set a cast-iron dutch oven on...
in the summer, charcoal OUTSIDE only, or camp stove DITTO.
And always have aCO detector in your house, no matter what.