Thanks GLTASN and Gido for the responses. I wrote a review of it here on Basenotes. I noticed that another review below mine also spoke of the ambergris tincture as smelling like bad breath, which is what it smells like to me. I am thinking that the ambergris tincture probably smells different and less appealing than an actual piece of ambergris that is heated up or burned. And perhaps the particular ambergris that was tinctured by AbdesSalaam Attar had not aged very long or was 'fresher' than some, and that is why it smells rather nasty. I do not regret trying it; it's certainly a fascinating substance.