Most small business owners are intuitively aware of what constitutes tax deductible marketing expenses, which include (but are not necessarily limited to) the costs of the following: Any sort of traditional advertising, such as newspaper ads, radio spots, brochures, and the like;
Mental/psychological dependence means somebody can't feel comfortable/relaxed anymore without the drug. This mechanism has nothing to do with the body, but with feelings of fear, pain, shame, guilt, loneliness and so on. The drug is used to forget problems which should be solved.
Psychological dependency is addressed in many drug rehabilitation programs by attempting to teach the patient new methods of interacting in a drug-free environment. In particular, patients are generally encouraged, or possibly even required, to not associate with friends who still use the addictive substance.