On March 16, 1997, at 1340 eastern standard time, N737ZC, a Cessna 172, was substantially damaged when it veered off the runway and collided with trees during landing at Cincinnati West Airport, Harrison, Ohio. The student pilot was not injured. Visual meteorological conditions prevailed and a flight plan was not filed. The instructional flight originated at Harrison, Ohio, and was conducted under 14 CFR Part 91. The pilot reported that he was practicing touch and go landings on runway 18. He said the airplane touched down sideways, with the nose pointing to the left. He added full power to realign the airplane on the runway, but the airplane veered off the left side of the runway, and collided with trees. The pilot reported his total flight experience to be 22 hours, all in make and model, and he also reported that there was no mechanical malfunction. The reported winds at the time of the accident was variable at 5 knots. He said the accident could have been prevented if he had not added full power.