Well, you should not encourage the use of steroids in any way to your class because it may spark an interest in someone who is not willing to learn the proper way and time to take them.
If I were you, I would lean more towards the "Abuse of Steroids"
Start out by emphasising that you in no way are promoting the use of steroids and then ease into how the abuse of steroids is becoming a problem.
Talk about how the media's negative attention only sparks interest in young adults and teens and they see it as an option on how to "get ahead" of your game.
The media seems to focus a lot on baseball players and steroid use. This in itself is an advertisement to people to go out and find steroids knowing that you will not be tested for steroids in High School so why not use them.
Ignorant young adults and teens get the idea from the media that steroids do indeed work, however, where do they turn to for proper usage when they finally get ahold of "The Juice"?
Do a little research and you will find that steroids will stop a person from getting any taller if their growth plates are not fully developed yet. This usually occurs around 23.
Abuse can cause minor health problems that could eventually lead to major health problems.
The most obvious side effect in irresponsible youths that use "gear" is going to be the aggression (roid rage). Depending on what type of steroid is taken, and the pre-existing mental condition of the user, there could be some serious rage and depression that may seem over-whelming to some people leading to thoughts of suicide or acts of violence.
If I were you I would head in that direction for a neutral response.
just my 2 cents.