The principal question raised on this appeal is whether a defendant convicted of violating the Uniform Narcotic Drug Law (N.J.S.A. 24:18-1 et seq.) may be punished as a second offender under N.J.S.A. 24:18-47(c)(2) when the second violation occurred, and the indictment based thereon was entered, prior to his first conviction under the act. We hold that he may not.