This is one of the first things I’ve learned about Amsterdam: Don’t go in a coffeeshop with your little kid in tow and believing that cakes and chocolate drinks are served there. There’s a difference between a cafe and a coffeeshop in Amsterdam.
Coffeeshop is where you can be served marijuana.
The air smells different near coffeeshops. For a non-marijuana user and a non-smoker like me, a smoked marijuana smells rather similar to tobacco but leafier.