Would you want a smart watch to have the ability to tell you blood alcohol level and/or other drug intoxication levels?

Would that be a turn off for you or would it encourage you to get one?
I have been working on a calibration for BAC and now have something that is extremely sensitive – resolution in the 0.002 range.
I am considering looking at marijuana and THC. Would you ever want to know your level?
Privacy is critical so the info must stay local, i.e. on the watch only.
How much would you pay for such a device?