i dont think any silicones ive seen have the warning "this is life threatening" but i have seen "may be harmful to your health" and i too have got the punch from silicone b4 but no headache just made my troat sore and clench up to stop me from taking a huge breath BTW alan i was only stiring b4 when i said is that from experience
i know the risks from silicones and the like as i used to work with them every day for a year as a labourer