I would tell him the bad things about steroids as it is harmful to most people. Firstly, steroids can shorten your life span as it makes you grow faster and grow old quicker. For example, in the recent studies in NSW, researchers have found out that steroid abusers die in their 20s and 30s. The people who abused steroids have overdeveloped muscles. Secondly, steroids might trigger mood swings and abusers would get angry more often, and its easier to develop suicidal thoughts. Thirdly, taking steroids will have liver damage and adrenal exhaustion.