... 'tube' or 'pipe'. Cinnamon oil was used as a temple incense, while the Egyptians used it for foot massage, as well ... aldehyde and benzyl benzoatePrecautionsCinnamon oil, that is extracted from the leaf, is non-toxic. Caution must be exercised since the cinnamaldehyde ... be avoided in pregnancy.High dosages can cause convulsions. The leaf oil should be avoided during pregnancy, while the essential oil ...