We all knew that caffeine lowers your chances of carrying a successful pregnancy, but did you know that smoking can counteract that? Yes, it turns out that smoking may upregulate the enzymes that detoxify caffeine … so it doesn’t stay in your system as long to cause problems for your fertility. But don’t get too excited because smoking can cause a laundry list of damaging affects to your reproductive system and to a fetus… not to mention a newborn.
 
Reprod Toxicol. 1998 May-Jun;12(3):289-95. Caffeine intake and fecundability: a follow-up study among 430 Danish couples planning their first pregnancy. Jensen TK, Henriksen TB, Hjollund NH, Scheike T, Kolstad H, Giwercman A, Ernst E, Bonde JP, Skakkebaek NE, Olsen J. Department of Growth and Reproduction, Rigshospitalet, Copenhagen, Denmark.

A new study looked at caffeine intake and proneness to hallucinations and found a statistically significant correlation. Of course we all know that caffeine is a stimulant, but it’s not well known that it’s psychoactive. One more reason to avoid (or consume) coffee … depending on your proclivity for hallucinating.
 
Caffeine, stress, and proneness to psychosis-like experiences: A preliminary investigation. Personality and Individual Differences, In Press, Corrected Proof, Available online 19 December 2008,
Simon R. Jones and Charles Fernyhough