Anything that got into the container holding the butane would have to be as volatile as the butane, I think. So it wouldn't be a long-lasting contaminant as it'

Anything that got into the container holding the butane would have to be as volatile as the butane, I think. So it wouldn't be a long-lasting contaminant as it'd evaporate very quickly, along with the butane. But if I'm wrong, if it wasn't volatile at room temperature & pressure, it would remain in the container as the butane was released so probably never meet the THC/weed anyway. I dunno, but that's my reasoning.