Is it immoral to smoke Marijuana?

 

Yes.

φαρμακεία, φάρμακον [pharmakeia /far·mak·i·ah/] n f. From 5332; GK 5758 and 5760; Three occurrences; AV translates as “sorcery” twice, and “witchcraft” once. 1 the use or the administering of drugs. 2 poisoning. 3 sorcery, magical arts, often found in connection with idolatry and fostered by it. 4 metaph. the deceptions and seductions of idolatry.
Strong, James: The Exhaustive Concordance of the Bible : Showing Every Word of the Text of the Common English Version of the Canonical Books, and Every Occurrence of Each Word in Regular Order. electronic ed. Ontario : Woodside Bible Fellowship., 1996, S. G5331

See:

Mood medications by Darrell Ferguson (right click, open)

 

Is it immoral to smoke Marijuana?