Blended fruits and veggies are nutritionally comparable to their whole counterparts. So, if making a smoothie helps you get more produce into your day, then by all means continue doing so! That said, smoothies may be a little less satiating than their whole counterparts.
Fruits and veggies should never be mixed together. Fruits have more sugar content and are difficult to digest. As they stay in your stomach for a longer period while the fruits ferments and produces toxins which could cause diarrhea, headcahes, infections and stomach pain.