Why do you think psychoactive drugs are classified into groups?

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Psychoactive drugs affect the way a person thinks and feels—which may also affect the way they behave. The most commonly used legal psychoactive drugs, apart from drugs taken on prescription, are alcohol and tobacco. The most commonly used illegal psychoactive drug is cannabis (marijuana).

Explanation:

Psychoactive drugs are divided into three categories (some drugs fall into more than one category): Depressants slow down the activity of the central nervous system (the brain and spinal cord), which reduces a person's alertness, and also slows down functions such as breathing and heart rate. Examples of depressants are alcohol, heroin, cannabis, the prescription drug group of benzodiazepines and other prescription tranquilisers. Stimulants increase the activity of the central nervous system, making the person more alert and aroused. Examples of stimulants are nicotine, caffeine, cocaine, ecstasy and the methamphetamines, speed and ice. Hallucinogens make a person see, hear, smell or feel things that aren't there. Examples of hallucinogens are LSD, magic mushrooms, ecstasy and cannabis.

avoiding recreational drugs instead of using them

out of the choices i'd say d the ability to set goals, mainly because to desire to continue you need motivation but it isn't motivation in that part, but setting goals means you have an endgame and you want to reach it which sums up motivation.