will flame resistant vinyl tubing release toxic emissions at vape temps ?

will common clear vinyl tubing from home hardware rated at max. 150f release toxic emissions at 350f-400f ?

it is flame resistant , when a flame is held to it , it wont easily melt.
i asked the guy at the store and he told me 150f was more of a precautionary measure and it would probably be fine but he couldnt tell me for sure for liability reasons.

probably a little. enough to matter? idk, but i only use borosilicate glass anyway.

I 'd think it would. flame RESISTANCE is no measure of what fumes may be emitted.

better to find another option I think.

cheers!