:-? Doubtful, I'd say. 'Douse' is not a common word (in any context), but this
COCA link doesn't list 'candle' among the (fairly sparse) collocates.
BNC (a much smaller corpus) lists even fewer.
That said, it'd be understood. I think it'd be more likely in cases of emergency or precaution, rather than just everyday snuffing;-)
b