A riddle by C.S

Question

My scent is fragrant, but danger to some
The more I cry, the hotter I become
Used oft only when the flow is severed
Rarely used after it was bettered

What am I?

Answer 1

Are you a

Candle?

My scent is fragrant, but danger to some

Some candles are aromatic, some are infused with insecticide

The more I cry, the hotter I become

A candle starts to drip when the wax becomes hot.

Used oft only when the flow is severed

I. e. when there is a blackout.

Rarely used after it was bettered

After light bulb was invented.