this video is somewhat legendary in glassblowing circles and it's been around for a fairly long time, I'm pretty sure this is not Devardi. There are quite a few companies like this around India along with many bead and bangle making factories. I posted a couple of other vids I found over the last year in the same
thread ramanglass posted the glass India thread of the process of beadmaking and bangle making over there.
Apart from the obvious health issues from carrying heavy things, repetetive strain, burns from catching hot blowpipes in the wrong spot, have a look at their furnacemen and batchmakers. None of them are wearing masks or respirators.
Back in the day, when batching in Europe was carried out in a similar way without protection, the average lifespan of a batcher was to about 40 years of age, give or take a few years, due to high incidences of silicosis in the lungs. The life of a glassblower wasn't much longer, because they worked in close proximity to the batchers.
What do you think the lifespan of one of these Indian batchers would be, counting bad nutrition and exposure to other, unrelated to glass, illness?