I've never heard of any titanium toxicity. Even concerns over aluminum have been largely dismissed. It's ironic, we have continuing toxicity from asbestos, older buildings with lead paint, shooting ranges and even a recent run of low cost eating utensils, toys and costume jewelry were made with low grade radioactive waste. Flashlight's main weight handicap are batteries. I imagine a titanium unit would be a reverse situation of "penny wise and pound foolish."