Wade,
a very good friend of mine is a doctor... (one of the good ones... he's been an ER doc for ~15yrs, isn't "in it for the money", etc. (though he does make a good amount!)
anyhow he doesn't drink, smoke, etc. never touched any drugs, runs, surfs (he's cool... half a century old, listens to punk music, surfs, and has a house on the beach and a great healthy family!), etc.
he told me that if I were going to injest anything with the intent of altering my concious state, it should be marijuana! he's never done it and probably never will, but he sees the worst damage of ALL drugs, first hand... both physical to the body and peripheral damage from driving, fighting, falling, etc. says that marijuana is hands-down the safest thing you could do... safer than coffee even...
Forrest