The only knock on cigarette sized PVs is the short battery life, and with the small batteries the inability to provide the necessary amperage to power the atty. The Prado has no information on the actual model or thread size they use, the best guess would be a 401 or 4081, common sizes for the "free trial" crowd. It could be proprietary junk, but there's no way to tell for sure. If you find an atty that will thread onto the battery, and make contact it will work and produce vapor. 3.7v is a common voltage for many e-cigs and mods and will power most attys, (except speciality high power attys made for HV mods).
The trick is to find an atty that has the proper threading for the battery you have now.??