Which is an important risk factor for drug abuse?

All drugs can lead to diseases and problems in your body.  Here are the negative effects of some common drugs:
Cocaine (otherwise known as coke): Increased heart rate, heart attack, stroke, death
Crack: Heart attack, stroke, death
Tobacco: Asthma, Heart Attack, Lung and Heart Cancer, Throat Cancer, Stroke, death
Marijuana (otherwise known as weed, pot, Mary Jane, or cannabis): increased heart rate, heart attack, cancer (the types of cancer that applies to tobacco), death
Steroids: Gives characteristics of opposite gender, heart attack, stroke, death, makes your muscles look fake.