Is it morally wrong for parents to smoke?

If you have children, and you smoke, then you are teaching your children to smoke by example. Children of smokers are far more likely to smoke than children of nonsmokers.

Isn't it immoral for people to teach their children to smoke, because that means there is an increased probability that the children will become smokers, and thus have all the ensuing health problems and shortened lifespan that comes with smoking?