=more cold air in ur system.
answer to ur question=no. wut will make ur car life shorten is torturing it. shifting quick, hitting lift, excessive wear...
but ppl who put the CAI
and exhaust push the car to its limits more, thats why it breaks down quicker.
its common sense, it shouldnt do anything to ur engine. exceptions when there too much cold air going in maybe? itll keep ur car cooler during cold days when you need it to warm up
p.s. if it is bad for ur engine, it is VERY minor. meaning ur engine dies 100-1000miles earlier.