Learn How To Grow Marijuana Indoors Today Bonus: The Best Amsterdam Coffeeshop Tour The strength and potency have increased greatly through advances in genetic manipulation and growing conditions (hydroponics), and today's marijuana can be used as much as 15 times stronger than the drug of the 1960 s and 70s. This dramatic increase in potency has nullified much of our understanding of the effects of the drug, and any research was done on the intoxication and damages of the smoked drug prior to about a decade ago do not accurately reflect the realities of today's marijuana. You Are More Than Welcome Share Your Thoughts And Honest Review