This is a brush that can paint smoke.
It might be able to use it for the effect of the cigarette or magic.
煙が描けるブラシです。
タバコとか魔法の効果とかに使えるかも。

Because it is not suitable for drawing at a tight angle, it looks like it even if I draw it with a gentle curve suitably.

きつい角度で描くのには向いていないので、ゆるやかな曲線なら適当に描いてもそれっぽく見えます。