The bill doesn’t prevent that; it’s not illegal to possess or smoke menthol cigs, just to sell them.
And adults definitely shouldn’t be allowed to sell anything they want. We’ve been there; it never ends well.
However, in this case it’s likely that the bill is being used to target “potential sellers in possession” which is stupid and should result in real disciplinary action for any LEO that attempts it. Since it never will, there’s definitely a problem. But the problem isn’t really with limiting the sale of menthol cigs.