Well,when you take 16 months,off a completely average bag,will kick your ass!!
Yea, especially when you IV it, and .15 none the less. Damn! I've seen friends that took a one month break fall out from shooting that amount or even less [my friend shot 2 bags that were 60mg each at the very most and his break was more like only 3 weeks, but it wasn't a serious OD but his body tensed up for a while, his chest was like sticking out with his back arched out, and he didn't respond for a good 15 mins but was still breathing (I wasn't there but my other close friend with him told me about it)]. I have personally seen someone OD off of less than 1 bag after taking a month off though.
If I were to IV after taking a break that long (I wouldn't though since I would be snorting it) I would start with less than half of a bag. Even after a few months of using a few times a week I've come across stuff that sniffing 1 bag had me as high as I wanted to be, and 2 had me puking, so I can only imagine what would have happened if I IV'd that stuff.
I've seen people in the DC thread I think it was who say they occasionally use and when they do it's like 0.2 IV'd. That's just crazy to me, and the stuff can't be good if you can IV that amount and not fall out. The bags here in NY aren't that heavy, but are very potent. 70mg or 0.07 is considered a nice size bag and .1 is considered really fat, yet even after using for almost a year and a half with only small breaks I can only handle 2-3 bags, so probably .2 since these bags were on the small side at like 50-60mg. The bags are small here but that's because it's really strong stuff and in some cases isn't cut by the dealers (it comes into the US already cut though, and a lot of seizures at the ports are measured by the DEA to be anywhere from 60-80 something % pure if I were to have to give an average between the numbers I saw when reading through those reports).
Personally I would never jump into IVing after a long break like that, and would try to stick to snorting (if it's powder like I get here in NY) or smoking (if it's tar like in BlueHues' case). The high from snorting dope lasts a lot longer than the high from IVing it, plus it's not as dangerous. You actually have a chance to get some help if you are overdosing since you can feel that you did too much and are getting too high, but with IVing it's two hits [you hitting your shot then you hitting the floor] <-- I guess I kinda stole that from the line people use when threatening someone when they are fighting, saying the fight will just be 2 hits; them hitting you then then you hitting the floor.