Some of the drugs that are abused where I live are: marijuana, ectasy, methamphedamines,cocain, pain meds...And I live in a small city. You would be surprised at what teenagers,being one myspelf, are using. And its usually the ones ull never think would do it. Almost everyone I know has or is still using ectasy, coke and other drugs.
Side effects to look for are looking tired all the time/ bags, not as active, not doing the things he/she normally does, loss of hunger, dialated pupils (effect while on), grades dropping, weight loss, depression or moping around alot, sleeping alot..If he/she uses often thier eyes will eventually start to sink in, nervousness, anxiety, shaking hands, paranoia..