Good point... lol
Funny story from when I was 18-19, many moons ago. I bought a package of caffeine pills, took a couple, they didn't hit me within the first 20 min. Took a couple more, nothing after another 15 min. Of course being that young back then, I thought nothing could harm me and I must have some manly resistance to the pills. So what did I do? I took the rest of the pills in the box. Hooo-lleeee crap, that did not go well for me. Once they finally hit, I had heart palpitations, I developed a feeling of paranoia about the oddest things. Didn't sleep for the next 2 days.
Finally when it was all over I promised myself I would never touch those things again.