Dilemma

The first customer in today proffered the palm of his hand and asked me to smell it.

What should my response have been?
Say,  "Eurrggh, are you KIDDING, no thanks." And run the risk of him taking his two-latte, two-slices-of-Victoria-Sponge business elsewhere?
Or really go for it, take a big sniff, and run the risk of making myself ill?

Generally I am risk-averse but on this occasion I sized up the situation (and the man) and decided to inhale. Deeply.
His hand smelled of coriander. He was taking a break from harvesting a field of what, he says, is some of the best he's ever grown.

Phew.