It sounds to me like your friend has maybe made up their mind on the ventilation situation, and is choosing to pretend it's not an issue. I get it--ventilation is hard to tackle if you don't have someone around that is really handy, who can help out with it. They might not have hurt feelings to hear you say you felt effects from the torch situation, but texting back that they didn't feel anything, instead of any acknowledgement that ventilation could be an issue, seems a bit like denial to me. Sounds like you're making the right decision here. I do hope that some time in the future a torch with ventilation finds its way back into your life.