The current laws are based on the drug being illegal so they aren't relevant. What you should be asking is what are the laws against selling tobacco and alcohol to minors. The answer is a fine and/or losing your business license.  That's it.  Tobacco and alcohol are addictive substances with known harmful side effects and no one who illegally sells them to minors is going to prison for 14 years.  Few, if any, go to prison for selling those substances to minors.