Disclaimer: This is not an endorsement of smoking, eating, or snorting (if that's your style) marijuana. Rather, it is an interesting look on the publicly stated reasons to not smoke pot and their evolution over a short period of time.
1. Reason to not smoke weed - You are funding worldwide terrorism, and the reason you should accept this is due to the factual nature of the statement...no citations necessary. Though it may seem preposterous that your self-employed, no doubt highly successful local pot-dealer has economic ties to Al-Qaeda, just play it safe and keep innocent civilians alive.