Writing about cannabis is no different than writing about any other topic on Wikipedia, except that it is. Here are some things to keep in mind.

• NPOV is a pillar. Always write neutrally. No soapboxing, either pro or con any issue.
• WP:NOTPROMO pertains when writing about the cannabis industry, a fine topic to write about, but maintain neutrality.
• Wikipedia is not censored.
• Notwithstanding the line above, we still write with encyclopedic tone.
• No legal advice. Enough said.
• Write for a global audience. Legality varies by jurisdiction. Cannabis is legal in entire countries and for various purposes. It is illegal elsewhere.
• Medical reliable sources standards are a bit more stringent than in most areas. Be aware of this when writing about medical topics. Good medical research may be hard to find due to scheduling in the United States and elsewhere.
• Since we write for a global audience and must remain neutral, we default to the word "cannabis" when referring to the plant, terming it "marijuana" only when referring to the drug harvested from the plant specifically, or in direct quotations, or when stating the use of the word as a legal term in a given jurisdiction (c.f. Marihuana Tax Act of 1937, Marijuana Policy Project).
• There is a substantial amount of strain information, cannabis culture aspects, and consumption practices discussed online by "trustworthy sources" that are simply not WP:Reliable sources, as despite their relevance in the community they lack neutrality, or have a profit motive, and/or often lack editorial oversight.

• Wikipedia:WikiProject Cannabis, addressing cannabis-related content
• Wikipedia:Identifying reliable sources (medicine)
• Wikipedia:Writing better articles