THC

THC is the main psychoactive compound in marijuana that gives the  high  sensation in real life.

These are its effects: Nausea V (1:00), Hunger XX (2:00), Slowness III (1:00), Regeneration (1:00)

The THC chemical reads as so: C21H30O2.

For all you uneducated folks out there, that's 21 Carbon atoms, 30 Hydrogen atoms and 2 Oxygen atoms.

Anyway, for those of you who REALLY want to get high, here's how you make THC: Here's a tip: if you're planning on getting high, bring plenty of food... That Hunger XX (2:00) sure is formidable.
 * Get a Chemical Decomposer and Chemical Synthesis Machine and supply them with energy.
 * To get carbon, decompose literally almost everything alive or once alive. This includes coal.
 * Hydrogen and oxygen can be obtained by decomposing anything with water.
 * Slap it all together in the synthesis machine in the right amount, and you're done.