This article is not applicable to and shall not prohibit:
(1) Casual transactions between persons, none of whom are thereby carrying on a business or business transactions;
(2) Agricultural operations such as farming, animal and poultry husbandry, forestry, and allied activity;
(3) The conduct of the businesses and activities referred to in Code Sections 10-1-575 and 10-1-576;
(4) The practice of the healing arts by persons licensed or otherwise authorized to practice the healing arts under the laws of Georgia.