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

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.

My question is this, How much do you know about what the asthma medication called Clenbuteral does to a normal healthy male in regards to body building? What are the adverse effects? And I don't need to be preached to about why I should take it or not. I just want the basic gist of what it does. Can you answer this? By the way this drug is not used in the US for any reason.