Difficult.
On the one hand, it is a filthy anti-social habit, and I feel people should be made to suffer the elements for indulging in it.
On the other - people have free choice, and probably feel enough of being social pariahs without being made to freeze and / or drown for their particular pleasure.
On balance, I would say yes, it would be appreciated by staff, and prevent lost work time as they dry off and / or warm up after a cigarette outside in the great British weather.