We spoke with a pair of cousins, one an Army veteran, the other a current member of the Navy, about some of the toughest situations they've found themselves in. Army basic training, according to Mates, is all about discipline. It's about knowing your role and not stepping out of line. And if you do, well, you pay a price. Mates said, In basic training, they call it 'getting smoked.' Push-Ups until you puke. I was always getting smoked.
Caffine is the most popular and probably the most studied of all drugs, and serious adverse effects in real life have resisted demonstration. There are pop claims about caffeine interfering with absorption of iron and vitamin d; if there were any real effect on real human beings, it would be obvious by now.
High lithium levels can cause shakiness, muscle weakness, slurred speech, nausea or vomiting, and drowsiness.  Keep your caffeine intake about the same. Keep amounts of coffee, tea, cola, and other soft drinks with caffeine about the same from day to day. Less caffeine can cause your lithium level to increase; more caffeine can cause your lithium level to decrease. Avoid caffeine because the effect of these drugs may be changed if taken within 40 minutes of caffeine.