I actually just figured it out.. Now I don't wanna flame altsmoke at all cuz I love their company. Everything they sell is top notch. However, I have a 901 atty that I keep my #1 adaptor attached to and strap it to the side of my TV Mint Chocolate chip juice so I don't haveta go looking for both the atty and adapter when I wanna vape it. Now I have another adapter (#2 adapter) ( cuz I got 2 at one time) and this is the one i tried to use with the carto. After inspecting the one I haven't used up till now, I noticed that the vent holes on the side of the new adapter are not fully reamed out. As a matter of fact, I don't think they are even partially unblocked (like the drill didn't go deep enough into the metal / like a valley instead of a hole). The reason for my super hard draw is that I was actually sucking the smallest amount of air through the threaded area between adapter and carto. No wonder.. So we'll chalk this one up as a defective adapter. No biggie they arent that expensive and like I said, I love altsmoke. I'll see if they will replace it in my next order. Even if they don't It doesn't matter I'll still order from them.