The Bible seems on the surface to advocate unncontrolled freedoms to consume all plants as one wishes as these are given by God, but there are plants and substances that have mind-altering constituents becoming potential ingredients for sorcery, witchcraft and idolatory. Whether these are prohibited substances or not, the Bible also does have views on deeds referred to as of the flesh.
Genesis 1 And the earth brought forth grass, and herb yielding seed after his kind, and the tree yielding fruit, whose seed was in itself, after his kind: and God saw that it was good.
Galatians 5 Now the works of the flesh are manifest, which are these ; Adultery, fornication, uncleanness, lasciviousness,  Idolatry, witchcraft (sorcery), hatred, variance, emulations, wrath, strife, seditions, heresies,  Envyings, murders, drunkenness, revellings, and such like: of the which I tell you before, as I have also told you in time past, that they which do such things shall not inherit the kingdom of God.
The word translated "sorcery" is the Greek word pharmakeia, from which we get the English word "pharmacy." The primary meaning is "the use or the administering of drugs" (usually associated with sorcery/idolatory). There is the strong suggestion that the Christian should not practise use of marijuana or drug use.
We do have freedom in Christ, but that freedom is not to be used to be turned to an opportunity for the flesh, but through love to serve one another. (Galatians 5:13), nor as a covering for evil, but rather to be used as bondslaves of God. (1 Peter 2:16)
Pat Robertson has crept slowly into a pro-legalization position on marijuana. In 2010, on “700 Club” he said perhaps rightly that people shouldn’t get long prison terms for taking “a couple puffs of marijuana.” Shortly afterward, his New York City-based spokesman, Chris Roslan, issued a statement saying Robertson “unequivocally” opposes the use of any drugs. Still it appears the evangelist favours decriminalization of pot smoking asking for it to be treated in a similar fashion as alchohol. The outcome of this would be more widespread pot smoking ... and easier access.
The Bible even if subtle on arguments related to criminalising vices - provides enough guidance for saints on how to respond to “controversial” issues that at least bear appearance of unrighteousness. Abstinence means not getting involved even in supposedly harmless doses.
I Thessalonians 5 Abstain from all appearance of evil.
We seem to test God when we speak for decriminalising marijuana in advocacy for toxic freedoms. Christ was once tested by satan with “stupid freedoms” backed by scripture.
Luke 4 And he brought him to Jerusalem, and set him on a pinnacle of the temple, and said unto him, If thou be the Son of God, cast thyself down from hence:  For it is written, He shall give his angels charge over thee, to keep thee: ...  And Jesus answering said unto him, It is said, Thou shalt not tempt the Lord thy God.
Someone argued that when a thing is available it loses its fascinations and allure. This is at best debatable. It is wiser to be cautious in our advocacy for we will be accountable someday for its consequence.