A study of Danish men found that those with a history of cannabis use experienced less cognitive decline from early adulthood to late midlife compared to non-users. Researchers used intelligence test results taken around age 20 and again at age 64. Factors like lower IQ, smoking, and drinking were also linked to less decline among cannabis users. A study of Danish men found that those with a history of cannabis use experienced less cognitive decline from early adulthood to late midlife compared to non-users. Researchers used intelligence test results taken around age 20 and again at age 64. Factors like lower IQ, smoking, and drinking were also linked to less decline among cannabis users. Health and Fitness, Health Tips, Exercises & Workout Tips, Diet & Wellness | Times of India Lifestyle