Isn't that the same kind of reasoning that resulted in the ban on Alar?
No, there was no long term study that proved that Alar was a danger. This study began in 1973, did the first IQ tests at 13 years old and the second tests at 35 years old.
You have to realize that if the impacts of second hand smoke from cigarettes has resulted in the restrictions on smoking, that the risk of brain damage to children is going to be a much greater threat.
The damage of lowered IQ cannot be undone. It’s permanent. Think of the potential for law suits and custody battles. Think of the potential for kids to sue their parents for permanent support “because you made me stupid by smoking pot in the house”.