I have and it works... it's not as rounded of a flavor as smoked malt. Wrights liquid smoke seems about the best, no preservatives just smoke water.
been a long time and don't remember how much, But charlie Papazian makes reference to it in his joy of home brewing book. (i'd look it up but I'm unpacking from a move and have now idea where the book is.)
Yankee Sand Flea on a Southern Beach.
“Son, you are a walking violation of the laws of nature, but you’re lucky, we don't enforce them laws.”