lifting weights has very little affect, cardio on the other hand does. when your lifting weights, do you honestly think it pushes your heart to the same level cardio does?
Anaeroebic vs aerobic heart capacity
Lifting weights is more anaerobic (like sprinting). Aerobic is more like marathon etc.
Just to shed a little light on this.
Regardless, 22 year old bodybuilders do not die due to "not doing enough cardio" It's because he was taking a lot of PED's and E's etc