Is Marijuana Dangerous to your Physical Health? Recreational use of marijuana has been going on for many years, and like cigarettes many people refuse to listen to health reports. More and more reports are coming out on the effects of marijuana on the body. Just how harmful marijuana can be is questionable. Some health reports state that it is very detrimental to the body while others are explaining how chemicals extracted from the marijuana plant are being used as medication. The problem is, just what are the effects, and how bad is it for someone who uses this drug?