Without trying to sound irresponsible, I sometimes wonder if we're over-egging the pudding when we go on about the so called terrible effect on kids?
Let's face it, little tiddlers wouldn't have a clue what it was anyway, any kids up to the age of about 10 would at best be curious, and from then onwards it's not so many years until they're considered 'grown ups'? I mean, for example teenagers can die for their country, they can vote, they can - and do- have sex, they can booze - and all manners of "undesirable things".
Plus, look at the violence to which they're subjected from such young ages - another 'no no'? but it goes on whether we like it or not.
And anybody who thinks that a school or its playground is a sanctum of innocence really needs to get a life.