Addiction is defined as repeated use of a psychoactive substance or substances, to the extent. Nicotine addiction is the fundamental reason that individuals persist in using tobacco products, and this persistent tobacco use contributes to many diseases. Cigarette smoke is a complex mixture of chemical compounds that are bound to aerosol particles or are free in the gas phase. Researchers have estimated that cigarette smoke has 7,357 chemical compounds from many different classes . In assessing the nature of tobacco smoke, scientists must consider chemical composition, concentrations of components, particle size, and particle charge.
Five forms of NRT are available in Australia: chewing gum, transdermal (skin) patch, lozenge, mini lozenge, inhaler and sublingual tablet. Nicotine nasal spray is available in other countries, but not permitted for sale in Australia. The gum and lozenge come in 4 mg and 2 mg doses, while the inhaler and tablet come in the 2 mg dose only. Sets of patches come in three sizes: the 24-hour patch has dosages of 21 mg, 14 mg and 7 mg, and the 16-hour patch has dosages of 15 mg, 10 mg and 5 mg.China, with 20% of the world's people population, experiences almost one million tobacco-related deaths per year. This number is projected to reach 2 million annually by 2025 and 3 million by 2050. Thus, a total of 100 million Chinese will succumb to a smoking-related death in the next 50 years if the current smoking rate persists. However, intensive smoking cessation treatment is not routinely offered to smoking patients diagnosed with cancer.