If the offender is over the age of 18 and the offense consists of selling, furnishing or giving such controlled substances as enumerated in Schedules I, II, III, IV and V to a person who has not attained the age of 18 years the offender shall be guilty of a Class A felony. The imposition or execution of sentence shall not be suspended and probation shall not be granted.
(Acts 1971, No. 1407, p. 2378, §406; Acts 1987, No. 87-603, p. 1047, §8; Code 1975, §20-2-73; Acts 1988, 1st Ex. Sess., No. 88-918, p. 512, §2(1).)