Read this excerpt from a student’s persuasive essay about smoking. which would make the best concluding sentence? tobacco smoke is one of the most common asthma triggers. tobacco smoke—including secondhand smoke—is unhealthy for everyone, especially people with asthma. secondhand smoke is a mixture of gases and fine particles that includes smoke from a burning cigarette, cigar, or pipe tip and smoke that has been exhaled by someone who smokes. secondhand smoke contains more than 7,000 chemicals, including hundreds that are toxic and about 70 that can cause cancer. if you have asthma, it is important to not smoke and also to avoid secondhand smoke. it’s impossible to avoid secondhand smoke, but you should at least quit smoking. if you are a smoker, you should avoid people with asthma.