Speaking of cancer, I only just now stumbled upon this old post from Discover's Cosmic Variance blog that ties in a famous Palomar astronomer with an ad for tobacco. Check it out and you'll see a what looks exactly like a famous Palomar telescope selling death sticks. Yikes!
This was not an "official" ad in that it (thankfully) did not mention Palomar Observatory by name. There have been many ads that have done so. From time to time I'll be posting a few of them here.