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.
Physical dependence is not equivalent to dependence or addiction, and may occur with the regular (daily or almost daily) use of any substance, legal or illegal, even when taken as prescribed. It occurs because the body naturally adapts to regular exposure to a substance (e.g., caffeine or a prescription drug).