I think it's very rare though for a smoker to not smoke several a day. A friend of mine was that rare breed and would buy a 10 pack occasionally - usually on a Friday and it'd be gone by Monday - but that would maybe be once a month. I think every other smoker I've met though goes through that amount every day.
So it seems to me the average smoker is much more likely to become a burden on a nationalised health service than the average drinker. There's more to this of course, smoking to excess generally doesn't increase the chances of you getting into a fight like drinking does for some people, but social pressure counters that partially too.