The following passage is from a BBC news article.
Prescription pill abuse is taking off in Sudan's conservative society, partly because it lacks the social stigma and pungent, giveaway odour of alcohol and cannabis.
I get the overall meaning of it. However, I do not understand the grammar structure of the last part 'giveaway odour of alcohol and cannabis' giveaway odour of alcohol and cannabis. Shouldn't there be a 'and'and before 'giveaway odour of alcohol......' ? Orgiveaway odour of alcohol, or is the last comma being used as gapping comma?