I would say lung cancer. Smoking affects ur lungs the most
The brain gets used to you taking the drug. Some drugs will affect your neurotransmitters, or messages that get sent to your brain that regulates how we think or feel. You will eventually become dependent on the drug so if you stop you might feel sick or go through "withdrawal". Which people dont want to go through so they will continue to take the drug.
Explanation:
My sister do it too and it's more effective
Madison needs better coordinates practice. With her cardio respiratory endurance she could outlast oponents so increasing coordination will benefit her softball playing results.