White smoke comes when start the car but no coolant leak .

whenever I start my car there is a white smoke coming from the exhust in the morning but no coolant leak , no hard start up issue s... but yet very recenty I replaced my coolant bottle and my dealer broke the radiator nipple and they fixed it and after replacing a bottle whenever I start the car my car smells different and I feel that coolant is leaking in a small amount as I keep track n it. if it s leaking from the nipple is it a problem