I have a two year old gas balloon still filled with gas. Is it poisonous to let it out?

or:I have a two year old gas balloon still filled with gas. Is it poisonous to let it out?or:Well, I presume it is filled with helium and no it is no

or:I have a two year old gas balloon still filled with gas. Is it poisonous to let it out?

or:Well, I presume it is filled with helium and no it is not poisonous. Even if it is some other gas.

Tags:poisonous,years,