Ice has no calories and takes up a lot of space in smoothies. Again, ive made smoothies like this so many times and theyre delicious. Smoothies do not have to be huge -- i understand when you're purchasing one they tend to have more stuff in them to get the value you're paying, but homemade smoothies tend to be about a cup or so, plus ice.

To get mathy:

All of those add up tp roughly 1.1cup without ice

1.1cup translates to 312ml

1 can of soda, beer, whatever is 355ml (diff is 43ml)

If you put ice in a glass, you can easily fill it with a can.

If you add a decent amount of ice to the smoothie, it'll be a very reasonably sized smoothie. It may not fill a pint glass, but I do not want to drink that much smoothie lol