Welcome to the forum! Sorry to hear about the cancer. If you are definitely going to be eating smoothies for the rest of your life, you might want to invest in something like a Vitamix, if you haven't already done this. A Vitamix will blend ingredients so fine that things like tomato skins and seeds are more or less gone - you pour it through a strainer, and nothing is there! Things like cooked noodles would more or less dissolve - it would probably thicken the soup considerably. Things like beans grind up so fine, and thicken more than when ground in a regular blender, or with an immersion blender, so you have to add some more liquid. One thing you'll find out - things will blend smoother when thicker, as when very thin, the things like seeds will bounce around in the thin liquid, while when in thick liquids, they get broken up more. This happens with ice, in smoothies - in the beginning, when thin, the ice will break up some, but small pieces will continue to bounce around, until I add more ice, and it thickens up more, and the small pieces break up, and when it gets very thick, the ice is totally ground up.
Something that I don't often do, but can be done in the Vitamix, is to "cook" soups, simply by running it on high for several minutes. I often use this heating method, when grinding up ingredients for Mexican sauces, plus, nothing grinds up chile skins and seeds finer than this.