I would include why those drugs are bad for you, what it does to your body, and interviews with people who used to smoke.
Because it's easier to understand:)
Call 911, give clear directions on how to locate you, stay calm. Since it is a busy park, call out for help. If someone is near you, ask for help. Keep trying. If you hear EMS, call out or ask someone to point where you are.
ALWAYS stay on the phone with 911 until EMS arrives. Describe different landmarks near you.
This scenario assumes you have a cell phone.