Welcome to the Candy Crush Saga Community
Do you have a question or need help with your game? Ask the Community.
I've seen these a few times too. The 'smokey' or 'electric' parts doesn't follow the candy, it stays in the same spot no matter what other candies are combined. I haven't figured out anything beyond that though and nothing seems to happen in/around them. In my screenshot, it's the very bottom row, 6th candy (blue). I have no clue.