A joint is a herbal cannabis that you can smoke

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Cannabis can be smoked as a spliff or joint. Or used in making tea or "hash" cookies, Usually mixed with tobacco aswell

A spliff is a marijuana cigarette or "joint" that contains tobacco in addition to the cannabis. Spliffs are commonly made by emptying out the tobacco, mixing it half and half with cannabis and then refilling the cigarette tube.

Cannabis is already illegal.

Making cannabis illegal increases crime rates because every time someone lights a joint, they commit a crime.