Smoking, when used to refer to human practices, is the practice of burning and inhaling the smoke from tobacco. Tobacco is a product that is mainly processed from the leaves of a nicotine plant. However, it is important to embrace a wider definition of smoking in human aspect to include other substances that are smoking. People do not smoke tobacco alone. They also smoke marijuana and other hard drugs like heroine. Therefore, when talking about smoking in the public domain, all these substances should be considered. In other words, smoking should be considered as any human activity through which smoke is emitted.