Forced advection of passive tracer in nonlinear medium by a smooth flow is
considered. Effective theory for small scale scalar fluctuations is shown t
o be linear (asymptotic free) and universal. Structure functions demonstrat
e an extremely anomalous, intermittent behavior while the dissipative anoma
ly is absent in the problem. (C) 1999 American Institute of Physics. [S1070
-6631(99)00708-4].