Someone else who's quite sure of something that they have no figures to support. In fact, the 1.7bn figure is the estimated total annual cost to the NHS, and that figure is quoted as "up to", i.e. the maximum in Smoking Kills, the last government white paper on the subject.
And as far as the ageing of the population, infertility is the least of our worries. People are starting families later, and having fewer children than they used to. Pointing the finger at smokers for that is about as sensible as blaming the little pixies...