The health risks of cadmium are real, but they're mainly an issue if you're going to extract cadmimum from the joint afterwards, maybe by wearing soldered jewellery or by using a silver teapot or wine jug. If you're just brazing carbie tips and you have reasonable fume control while you've got it hot, then it's no problem.
Personally I worry about fumes from a fluoride flux more than I worry about the cadmium.
Either rig a fume extractor over the work to suck up the Bad Stuff and get it outside and away (when working indoors), have the prevailing wind or a fan at your back so you get clean air while working, or both. Problem solved. ;-)
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