Does the x2 damage dice you get from a crit hit apply to smite dice?

@mikemearls @JeremyECrawford @ChrisPerkinsDnD @matthewmercer For Paladins, does the x2 dmg dice you get from a crit hit apply to smite dice?

— Mech45 (@Mech_45) February 15, 2017

"All dice, roll twice." #crit #WOTCstaff https://t.co/ljzgTNIiUj

— Christopher Perkins (@ChrisPerkinsDnD) February 15, 2017

@ChrisPerkinsDnD all bonus, leave it aloneus

— Carl Huber (@natural20shirts) February 15, 2017