收入与吸烟量关系（关系探索）

def solve():
    import pandas as pd
    import matplotlib.pyplot as plt
    import numpy as np
    
    url = 'https://liangdaima.com/static/data/wooldridge/smoke.csv'
    df = pd.read_csv(url)
    
    plt.figure(figsize=(10,6))
    plt.scatter(df['income']/1000, df['cigs'], alpha=0.5, color='gray')
    plt.title('收入与吸烟量关系', fontsize=14)
    plt.xlabel('年收入（千美元）', fontsize=12)
    plt.ylabel('每日吸烟量', fontsize=12)
    plt.grid(alpha=0.3)
    plt.tight_layout()
    plt.show()
    return "可视化代码执行完成"