What is, overall, safer for your body: alcohol or marijuana?

1) I have a large amount of course work, which is combined with a job and extra-curriculars, and while I want to succeed in all of them, I find that I simply don't have enough time, even though I currently sleep only 4 or 5 hours a night. I mentioned this to a group of my friends here at school, and it turns out they all take stimulants to help them manage jam-packed undergraduate life. The pills are called ADDERALL and PROVIGIL. I have acquired some for myself, but before I take them, could you tell me if either has serious health risks? I do not have any other health problems or take any other medications. A few of my friends tell me that they sometimes stay awake for as long as 3 or 4 days. If it is reasonably safe, that would be great! Thank you.

2) Given the fact that this is a top-notch school, it's total hoo-ha that you haven't included any info on all the non-hard core, but still illegal, "study stimulants." Is all this ADDERALL gonna do me permanent damage or what?

Does acid (LSD) have a detrimental affect on women who use the birth control pill? Is it possible for a woman to be impregnated by pre-ejaculatory fluids four days after the menstrual cycle after unprotected sex?

I recently drank one shot of absinth(e) mixed with water at a party. I read up on it online and opinions differ vastly as to the potential for negative side effects. At this point my imagination has me suffering every possible one.

I would like to know the true possible effects and if one drink could realistically cause them. If it helps, the brand I had contained 100mg of thujone and it was Czech and I'm told they use an extract which is worse than using straight wormwood.

I hope you can help because I'm a little freaked out, the guy who gave it to me drank it extensively and recently committed suicide and I'm convinced the cause in part was the Absinthe.