Any person who commits any offense prohibited by section 87b of this title (except an offense prohibited by paragraphs (a)(7), (a)(8), and (b)(4) in which case the person shall be subject to the general penal statutes in title 18 relating to crimes and offenses against the United States) shall be guilty of a felony and shall, on conviction thereof, be subject to imprisonment for not more than five years, or a fine of not more than $20,000, or both such imprisonment and fine.