What causes my Lexus to have white smoke and also huge amount of fluid under my hood?

White smoke from your Lexus typically indicates that coolant is leaking into the engine, which can result from a blown head gasket, a cracked engine block, or a damaged cylinder head. The large amount of fluid under the hood is likely coolant pooling due to these issues. It's crucial to address this problem promptly, as driving with a compromised engine can lead to severe damage. Consider having a professional mechanic inspect your vehicle to identify and resolve the issue.