The possibilities of reduction of the lasing threshold due to the anomalously strong absorption effect are theoretically investigated for a distributed feedback (DFB) lasing in chiral smectics. It is shown that a minimum of the pumping wave intensity may be reached for the pumping wave propagating at an angle to the helical axes under diffraction of the pumping wave. The lowest threshold pumping wave intensity occurs for the lasing at the first band-edge lasing mode and the pumping wave propagating at an angle to the spiral axes corresponding to the first absorption maximum of the anomalously strong absorption effect at the edge of stop band. The corresponding analytical expressions are given for the case of the average dielectric constant of LC coinciding with the dielectric constant of the material limiting LC. If the pumping wave frequency is close to the lasing frequency the pumping wave propagation direction minimizing the threshold is not far from the helical axes and the pumping wave polarization minimizing the threshold is close to the circular one with the sense of chirality the same as one of the LC helix. Numerical calculations of the DFB lasing threshold at diffraction of pumping wave are performed for the typical values of the related parameters.