Among the teams he played with were the Cobalt Silver Kings, Toronto Tecumsehs, Ottawa Senators, and Montreal Wanderers.

[2] Harry Smith first played senior-level hockey with the Ottawa Aberdeens of the CAHL-Intermediate league in 1901.

[6] He became a professional player in 1907–08 with the Pittsburgh Bankers of the Western Pennsylvania Hockey League (WPHL).

[7] In 1908–09 he was a 'for hire' player playing for the Bankers,[8] Toronto Pros (OPHL), Haileybury Comets (TPHL) and Montreal Wanderers (ECHA), where he was member of the Wanderers 1909 Stanley Cup challenge championship squad, although the team did not hold the Cup at the end of the season.

In December 1909, prior to the 1909–10 season, Smith was badly scalded on one if his legs by the bursting of a valve in a steam engine while working for his father Henry in Fort William.