'In the time of the late Mrs Betteredge,' I said, 'I felt pretty often inclined to try your philosophy, Mr Franklin. But the law insists on your smoking your cigar, sir, when you have once chosen it.' (188.8.131.52)
Again, Betteredge brings up his wife to make a point about women in general. The metaphor he and Franklin Blake are using to describe women is rather sexist, but kind of funny at the same time: they compare women to cigars. If you don't like the cigar, you throw it away and try another. But, as Betteredge points out, the marriage laws require a man to "smok[e his] cigar" after he's chosen it (i.e., after he's chosen a wife).