Biology: The Unity and Diversity of Life (MindTap Course List)
Biology: The Unity and Diversity of Life (MindTap Course List)
15th Edition
ISBN: 9781337408332
Author: Cecie Starr, Ralph Taggart, Christine Evers, Lisa Starr
Publisher: Cengage Learning
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Chapter 38, Problem 1DAA
Summary Introduction

To determine: How the effects of low-level tobacco smoking on forced expiration volume differ from those of low-level marijuana smoking.

Concept introduction: Smoking has a wide range of negative health effects. It increases the risk of lung infection and many types of cancer. Tobacco contains more than 40 carcinogens. Tobacco smokers have a higher risk of cardiovascular disease. Another smoking material is marijuana which contains carbon monoxide and an assortment of carcinogens, including arsenic and ammonia, but few studies have not found an increased risk of lung cancer who only smokes marijuana. The people who smoke both marijuana and tobacco seem to have more respiratory problems than those who smoke only tobacco.

Expert Solution & Answer
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Explanation of Solution

Forced expiration volume is the volume of air that an individual can exhale after a deep inhalation. Smoking alters lung function that results in breathing problem that can change the forced expiration volume.

The data represented is based on the study done for effects of smoking to assess lung function by the Coronary Artery Risk Development in Young Adults (CARDIA). The study involves about 5,000 people aged between 18 to 30 years old in a long-term study. The study was followed for 20 years and periodical assessment of habit, health, and lung function was conducted to know how the lifetime use of tobacco and marijuana affects the forced expiration.

Refer to Fig. 38.19 “Association between marijuana or tobacco smoking and the change in forced expiration volume (FEV)” in the textbook, the low-level of tobacco use causes a direct decrease of FEV, but the low level of marijuana use causes an increase in FEV first, and then a decrease in FEV. In comparison to tobacco use, the decrease in FEV is low in the marijuana user.

Conclusion

Tobacco causes decrease in FEV right away, but marijuana causes an increase in FEV first, and then a decrease in FEV.

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