No, wetsuits should not be used as a replacement for life jackets. Although they provide some buoyancy, wetsuits are not designed to keep you afloat and face-up in the water, which is essential for supporting life-saving breaths. Life jackets are specifically engineered to keep your head above water in various positions and conditions, increasing your chances of survival in an emergency. Always wear a properly-fitted life jacket when engaging in water activities where there is a risk of drowning or injury.