lol are u kidding? lol here 1. get a lighter, 2. light rubber 3. if u see smoke or if it smells like buring rubber the YES
naw its cool bro, but seriously its common sense...what were u planing to use the rubber for? the downstem?
I'd be wary. The heat of drawing smoke through rubber could burn or melt some of it off, effectively entering itself into your lungs. Be careful.