no
cinnamon is a "tank cracker", it eats the plastic material away and usually is best only for pyrex or glass tanks. those melted plastics may be nestled in your tank now and you could potentially breathe them in on your next refill of another juice.
do a search for "tank cracker" and somewhere is a post of juices that plastic tanks dont handle well, i think in General Vaping or General E-Liquid Discussion threads.