White smoke with sweet smell on cold starts

Does a coolant leakage always cause continuous white smoke from exhaust or it can be just for first couple of minutes during a cold start?

My problem/concern as explained below. Sorry in advance for the lengthy explanation.

Hi All,

l used to daily drive my car listed above s coupe and for last two to three months, I have been starting it may be once or twice a week for short trips within the city.

I started to let the car warm-up for a minute or two before driving it and it is when I started to notice sweet smell and white smoke coming out of the exhaust until the car warms up. During warm up, the car idles rough at around 1200 rpm and slowly comes down to 600-800 rpm as the engines reaches its operating temperature.

My first thought was coolant leakage and started to check the levels of coolant in the reservoir. The level remains same although I have to admit that I never drove the car for long distances since noticing the smell.
I acquired the car in July 2018 and it had around 43,000 kms then. Now, it is close to 50,000 kms. I did got it checked by local Infiniti dealer at the time of buying the car and they told me that the car is in very good condition.

i am still concerned and am very much tempted to try to use gasket sealants liquids available in AutoZone. The car is due for regular maintenance this month.

Below are the checks I did:

1. No change in the level of coolant in the reservoir(white box with min and max).
2. No bubbles observed from the coolant next to the engine.
3. After letting the car warm up, there is still very small amount of white smoke coming but without the smell. I gave the accelerator hard pushes for couple of seconds and observed that the density of white smoke increased a little with smell and also observed small drops of water dripping from the exhaust. 
the water was colorless and odorless. I let the car idle again for couple more minutes and this time there is no noticeable white smoke or smell from the exhaust.
​​​​​​​4. Engine oil cap looks clean beneath with no milky substance observed.

After letting the car cool for an hour or so, I restarted the car and this time there is no white smoke. However, when accelerated a couple of times, I did noticed a pale white smoke with water drops again from the exhaust.

Sorry for the lengthy post. Kindly let me know if I need to be worried about my car.