At 18 you don't have the depth of addiction that will come in a short number of years. Your name is traintolive, and that is not just weight training, but brain training. If needed, tell your friends you have developed a severe allergy to the cancer sticks (which we all do, ergo cancer), and I doubt anyone will give you a problem. You are stronger than your think. Traintolive healthily, without cigarettes, drugs, etc.
I was a sugarbaby; meaning since I was born I was given lots of sugar, and ate lots of processed foods, especially sweets until I was into my thirties. Most people in the west were/are sugarbabies.
“How does today’s youngster educate his sense of taste? By submerging it in a sea of sugar from the time he gets up to the time he goes to bed.” W. Root and Richard DeRochemont, Eating in America (1976)