do you smoke cigarettes How many you're indirectly smoking Smoking - Wikipedia

According to the study, the eight-point drop was found in subjects who started smoking in adolescence and persisted in habitual smokingusing it at least four days per weekin three or more of the five testing waves

Vasiljevic M, Petrescu DC, Marteau TM

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Occasional marijuana users may experience temporary cognitive impairment, while heavy users risk more permanent cognitive decline, including lower IQ scores and reduced verbal learning abilities, over time