Except as authorized in the Drug Control Act (§ 54.1-3400 et seq.) it is unlawful for any person to transport into the Commonwealth by any means with intent to sell or distribute one ounce or more of cocaine, coca leaves or any salt, compound, derivative or preparation thereof as described in Schedule II of the Drug Control Act or one ounce or more of any other Schedule I or II controlled substance or five or more pounds of marijuana. A violation of this section shall constitute a separate and distinct felony. Upon conviction, the person shall be sentenced to not less than five years nor more than 40 years imprisonment, three years of which shall be a mandatory minimum term of imprisonment, and a fine not to exceed $1,000,000. A second or subsequent conviction hereunder shall be punishable by a mandatory minimum term of imprisonment of 10 years, which shall be served consecutively with any other sentence.