The best way to ensure your weed is great is to buy the best seeds from a reputable seed company and grow your own. For the past 15 years I have only smoked what I grow myself. My last harvest was extraordinarily POTENT and I think the one thing I did differently last harvest was I allowed my plants to flower an extra 2 weeks after they looked totally ripe. I have had a number of successful harvests but last November I harvest the most unbelievably powerful stuff of my life, outdoors.

The first time I sampled my NorthernLights#5 I took 3 moderate tokes and it smashed me, overdose. I swear I was sooooo fucked up that I could hardly stand up, within a half hour I started barfing my guts out for several hours. Each time I staggered out my back yard to barf. That taught me to only take ONE toke and wait a while before the next. And I've been smoking daily for 15 years, so I must have some tolerance built up.

I really believe the trick is to flower extra long time to really plump up those resin glans FAT and extra ripe, for maximum potency.