The slave hates smoking and the Mistress knows that very well. That is exactly why she loves smoking next to him just to see his suffering expression. The slave genuinely hates it, but has no other choice than enduring the sickening smell and trying not to cough too much from the smoke. The Mistress is cruel enough to even make him eat the ash from her cigarette, practically using him an a human ashtray. The slave keeps swallowing the ash while trying his best not to get sick from it.