Fair question... and a bit of Googling came up with
this story from CNN that looks into it a bit. Short answer... it's more dangerous than smoking.
But to echo what everyone else has added, you'll make up your own mind. In fact, you've probably made up your own mind already, I dare say. I'd encourage you to drop both... in my ever-so-humble opinion, depending on where you want to end up in life, neither one will likely help you along the way, and both will cost you plenty of real money.
'Course, you could drop dead tomorrow, but life's always a gamble...
Good luck in your choice!