If the threat to other people doesn't motivate you (though it should), think about the chances of you getting a DUI because the cop pulls you over randomly and smells the weed in the car. Now I'll list the costs associated with that DUI.
Just because you've been lucky before doesn't mean you'll be lucky again. In fact, it's all probability. This could be the time you get the DUI. That shit is expensive. I consider the danger to other people the most critical factor.
But a simple non-injury DUI will cost you thousands of dollars. And months of drunk-driving classes and days of Work Program or jail. Missed work. $$. Add hospital bills if you have an accident and, hopefully, only injure yourself. $$$.
I don't know what state you live in, but it can take up to 8 years to be allowed to expunge a DUI from your driving record. Getting the violation expunged costs $ too. My state requires that you hire a lawyer to get the violation expunged. $$$.
Your insurance will be astronomical for the next 5 years at least. If you're under 25, count on your insurance being doubled or tripled. $$$.
Once you get that DUI, you will kick yourself in the head for being so stupid. I speak from experience. I know that I felt totally sober when I got popped for my DUI. I made a left turn and my reflexes were fucked. I side-swiped/rear-ended someone's car and fucked up my own. Which was a vintage Alfa convertible. Add repair bills. $$$.
Every time I consider driving when I feel sober and know I'd be able to drive safely, I think about how fucking lucky I was that I didn't hurt anyone but myself. That shit makes me physically sick to think about.
It makes me even sicker to associate monetary costs with the death or injury of someone else, but I will. You're talking jail time. GUARANTEED. Fines in the tens of thousands. Your victims' hospital bills if they live. Civil suits. $$$$. A felony on your record.
I'm an excellent driver too. That was the only accident I've caused in 24 years of driving. I've got 2 speeding tickets in that time and one cell phone ticket. 24 years/2 moving violations aside from the DUI.
Yeah, this post is long. Because I had to list *most* of the ramifications of a DUI. If you already have a DUI, just fucking sit down and hide your keys. Actually, even if you have a perfectly clean driving record, just make another plan for tonight and stay safe.