Couldnt agree more, the bad influence argument is weak imo.
As for the testing, nothing ever happens quickly these days lol, they'll get round to it eventually (and then try and work out how they tax it!)
I think the bad influence is very valid. I don't know anybody that smokes because they thought they taste nice. Always to impress or copy someone. I still think that until an official ruling is made health wise they shouldn't be allowed in.