Why didn't you just go to a headshop and get a $2 downstem?? Plastic breaks down when hot smoke touches it (and it's coming straight from the bowl so it would be) and when it breaks down it gives off toxic/cancer fumes. The bottles are okay but NEVER use plastic for a downstem unless it's actually high grade but those are just shitty marker tubes and are not designed for any heat.
Because I'm too lazy. I only use it to take snaps of AVB before bed, so I'm not too worried about it.