What It Is (and Isn't)

Cannabis is a plant, and the word is also a catch-all for the many things made from it: dried flower, hash, oils, edibles, vape liquid. They can feel like different worlds. Really they come down to the same handful of active ingredients, in different amounts and different packaging. Get those basics straight and the rest of this guide makes far more sense.

One plant, a few names

Weed, pot, grass, bud, ganja, marijuana, skunk, hash: these are mostly slang for the same plant, Cannabis sativa, or for its various preparations. "Marijuana" tends to mean the dried flowers you smoke. "Hash" (hashish) is the compressed resin. "Skunk" is UK slang that's come to mean strong, high-THC flower. None of these are separate drugs. They're forms and strengths of one thing. The one genuinely different case is hemp: the same species bred to contain almost no THC, grown for CBD, fibre and seeds. Hemp won't get you high, which is why it's legal and cannabis isn't.

The two ingredients that matter most

The plant contains dozens of active compounds (cannabinoids), but two do most of the heavy lifting. Telling them apart is the single most useful thing to understand.

THC is the one that gets you high. It's behind the euphoria, the altered senses and the buzz. It's also behind most of the risks, from anxiety and paranoia in the moment to the longer-term concerns. When people worry about cannabis, they're really worrying about THC.

CBD is the one that doesn't get you high. On its own it's non-intoxicating, and it appears to take some of the edge off THC's effects. It's what's sold legally in high-street shops as oils and gummies. Whether it does much at the doses people actually take is a separate, still-open question. The CBD page covers that honestly.

The ratio between these two is a big part of why one person's cannabis feels so different from another's. And it's changed dramatically over the years.

Why "it's just a plant" undersells it

"Natural" doesn't mean mild, and today's cannabis is not your parents' cannabis. Decades of selective breeding have pushed average THC up sharply while CBD has all but disappeared from street cannabis. The product on sale now is stronger and less balanced than what the old research and the old reputation were based on. STRONG That's not a scare point. It just means the strength is easy to underestimate, which matters when you get to dose.

The forms you'll come across

The same active ingredients reach you in very different ways depending on the form, and the form changes the risk more than most people realise. Smoked flower hits fast and fades within a couple of hours. Edibles come on slowly and hit much harder, which is how people get caught out. Vaping avoids the smoke but brings its own questions. Concentrates are extremely strong. Rather than repeat it all here, the next chapter covers what these actually do, and The Plant → How it's used lays out each form in full.

That's the groundwork. With THC, CBD, potency and forms clear, the obvious next question is what the stuff actually does to you.