It's not just what's in the blunt or bong that's a problem. Getting high is risky in a lot of ways - and not just medically. Intoxication compromises mental functioning in the short term by affecting memory and learning. Motor coordination and perception of sights, sounds, time, and touch are affected, which can cause car accidents and sexual problems. Lowered inhibitions can result in STDs and relationship problems. And you can also get a nasty chronic cough and mess up your respiratory and immune systems.
Laws in some states permit the use of marijuana for medical purposes. This is because THC - the active ingredient - is powerful enough to help treat the symptoms of glaucoma and reduce nausea in patients with HIV/AIDS or cancer. Indiana is not one of these states. Federal law considers marijuana a Schedule I Controlled Substance not widely accepted for medical use.
If you use marijuana, take the e-toke assessment to see if your use is getting out of control.
If one of your friends is using marijuana, you probably already know if there is a problem. Don't blow it off - if you're concerned, there is a good reason you feel that way. Learn how to talk to your friend about his/her use.