After a residence of seven years at Oxford, he returned, against the wishes of his friends, to Kirkaldy, the place of his nativity, where he lived for some time with his mother, without determining on any fixed plan of life; Mr. Smith having thus chosen to forego every prospect of church preferment, rather than do violence to his conscience by preaching a particular system of tenets. In 1748, being then in the twenty-fifth year of his age, he took up his residence in the capital of Scotland, when he first entered into public life, by delivering lectures, under the patronage of Lord Kames, on rhetoric and the belles lettres, which he continued for two years. These lectures were never published; but the substance of them appears to have been afterwards communicated to Dr. Blair, as he acknowledges, in his Lectures, to have been indebted to Dr. Smith for a manuscript treatise, from which he had taken several ideas in the eighteenth lecture, on the general characters of style, particularly the plain and the simple; and also the characters of those English authors belonging to the several classes in that and the following lecture. In 1751, he was chosen professor of logic in the university of Glasgow. Of the manner in which he discharged the duties of this important situation, it would be difficult now to present a more satisfactory account than that which has been given by one of his own pupils 'In the professorship of logic,' it is observed, 'Mr. Smith soon saw the necessity of departing widely from the plan that had been followed by his predecessors, and of directing the attention of his pupils to studies of a more interesting and useful nature than the logic and metaphysics of the schools. Accordingly, after exhibiting a general view of the powers of the mind, and explaining so much of the ancient logic as was requisite to gratify curiosity, with respect to an artificial mode of reasoning, which had once occupied the universal attention of the learned, he dedicated all the rest of his time to the delivery of a system of rhetoric and belles lettres.'