So I ask again, what is the biblical justification for modern day prohibition laws?
Deuteronomy 18:9-14
“When you enter the land which the Lord your God gives you, you shall not learn to [a]imitate the detestable things of those nations. 10 There shall not be found among you anyone who makes his son or his daughter pass through the fire, one who uses divination, one who practices witchcraft, or one who interprets omens, or a sorcerer, 11 or one who casts a spell, or a medium, or a spiritist, or one who calls up the dead. 12 For whoever does these things is detestable to the Lord; and because of these detestable things the Lord your God will drive them out before you. 13 You shall be [b]blameless before the Lord your God. 14 For those nations, which you shall dispossess, listen to those who practice witchcraft and to diviners, but as for you, the Lord your God has not allowed you to do so.
You may wish to note and study the terms "witchcraft and sorcery." Should you do so you will discover the terms are closely linked with the use of drugs, and in the New Testament, the Greek for "sorcery" is linked to English word (pharmacy, Greek pharmakeia). I know for a fact (having spent 10 years in addiction), that drug abuse opens up the mind and the spirit to demonic activity. It should also be noted that most recent studies on the use of pot causes real brain damage. We should also keep in mind that God ordained government with purpose, and part of that purpose requires it to protect man from his own stupidity and wanton ignorance. Sorcery, sorceries, witchcraft, and sorcerers were strictly denounced among the Hebrews, and God distinctly warned them of it. The penalty for such sin was death by stoning. "You shall not allow a witch to live."
You may also wish to note the warnings of Revelation 21:8, as well as 22:15.
But for the cowardly and [a]unbelieving and abominable and murderers and immoral persons and sorcerers and idolaters and all liars, their part will be in the lake that burns with fire and [b]brimstone, which is the second death.”
Outside are the dogs and the sorcerers and the immoral persons and the murderers and the idolaters, and everyone who loves and practices lying.
This is what God thinks of drug use for the sole purpose of reaching a euphoric state of mind, and altering the minds ability to think rationally; not to mention a yielding of the mind to the "powers of darkness." Men often do outrageous things under the influence of dope -- there is a reason they call it dope. Smoke all the dope you want, but it will make you dopey, drive you in the hands of darkness, then chain and shackle you. I know, I've been there!