What could be causing giant clouds of white tailpipe smoke on cold start ups.

Good morning. In the year and a half we owned the Liberty we discovered a few things: 1. Far and away the worst gas mileage of any vehicle it's size. 2. They rip out cam followers (lifters) like popping popcorn, This causing the engine to through diagnostic codes for ignition problems, although this problem is NOT ignition. About once a month I had both valve covers off changing out ALL of the followers; they just get stuck in the down position. (From Jeep, they are about $25 each, 12 in total, adding another $50 in gaskets, I went to NAPA for some, Autozone for others, never finding a difference. I cut some of the stuck ones up to see what was wrong, and nothing, just any tiny dirt or varnish and they get stuck. Always use synthetic oil with an additive like Seafoam, Marvel Mystery Oil etc., this is the only help. Jeep Liberty heads on the 3.7 V6 are garbage, (the Magnum V8 used in pickups is the exact same design by the way, using the very same parts, cam followers, pistons and all, so do not buy one of those either). I went through three of them, set of rebuilt heads, in the year and a half. Look even on Ebay at the price of rebuilt heads for the 3.7 compared to heads on other vehicles, they are VERY expensive, because there are so few good ones available to rebuild. They have very narrow gasket surfaces in a few places, and cannot hold head gaskets with the tiniest warp, but they also crack there, and are then scrap aluminum. 4. Lastly, now put a bunch of stop leak for radiators into your jeep and drive quickly to your nearest car dealer that will even take your Liberty, (we went to 6 dealers before one would take ours in trade, at any value, the first 5 laughed at us when we said we wanted to trade a Jeep Liberty) and trade that thing off, at any cost, right now, today, Saturday. They cannot be fixed. The problems in the 3.7 are all design issues which are out of our control. Buy a Toyota, Honda etc. and go back to trouble free. We traded ours off for a Toyota RAV4 V6 Limted, GPS, back up cam and all, after getting more white smoke out of the Liberty just 3,000 miles after the last set of heads, (3rd set remember). We got 12 - 16 MPG in the Jeep, and 24 MPG in the RAV with twice the power. The V6 RAV has a higher towing capacity, and is so much nicer to own and drive. The RAV is now at 75,000 miles, and not even a tune-up yet, just oil changes (synthetic of course now, I learned). In total, during the entire time we have now owned the RAV, we have paid less in car payments, 3-years, for the RAV than the Jeep cost just in replacing heads. DUMP the Liberty, and never, never, never look back or even think about buying anything ever again with the Jeep name, (Now Fiat-Jeep). 5. Finally, I promise you the owner of our LIberty had done the exact same thing. Ours was driven down from Alaska, to Salt Lake City, and traded in on a new Subaru, (we live in Oregon). I love to do research, and cars typically leave a good paper trail. I even found the name and address of the people who had owned it, but I never did contact them. Good luck to you.