*cough* I'll just come right out of the closet and admit that I'm a smoker :lemmetell
I don't smoke in the house so It doesn't bother my orchids and I usually was my hands after I'm done smoking (I have forgotten it once or twice before)
I would suggest casually mentioning to your friend that it's better not to smoke around the orchid as it harms the plant and flowers.
But I guess that's about all you can do, once you give an orchid away..it's out of your hands.
It's the same thing as giving some one an orchids and then noticing that it's beeing watered to death...nothing you can do except give the owner some advice...but if he or she doesn't pick up the advice...well then there's nothing you can do , it's not as if you can take the orchid back with you.