By contrast, smoking cannot be beneficial for people’s health, and even this cause damage for the health of smokers as well as people around them.
我认为,这个句子错误不少。表现在:
1. By contrast(相比之下),应为 On the contrary(与此相反)
2. be beneficial for sth. 改为 be beneficial to sth.
3. cannot be 表推测,这是不需要推测的,已经是事实。不如直接用否定 is not beneficial to。
4. this cause 改为: it causes
5. it causes damage for 改为:it causes damage to
本句,用 and 连接没有问题。句子结构的否定肯定,要服从于语义:两个分句都讲吸烟的害处,用 and 没有问题。