For me the dose makes the poison to a huuuge extent. I smoked around 0,6g in one sitting on Saturday around sunset. It had me spun out beyond all good reason, sure I went out to a show and had an crazy time but I forgot to drink any water, was still high as balls all sunday and sunday night, paranoid and anxious but geeked out of my mind, monday around sunrise I started to crash hard. All day I was listless, no appetite, still spun but my body was in disarray from that massive assault. Tuesday, Wednesday were again days for me to get drunk and stoned and eat massive amounts of food. A true "comedown" I didn't experience for a long time before that.
Thurs night (yesterday) I smoked around 0,25 and it got me good, it almost felt like as if there was something intrinsically different about the high. It was relaxing and allowed me to focus on tasks I needed to do around the house, and still gave me the euphoria I desired whenever I took a break to listen to music and play computer games. No twitchyness or paranoia at all, and it was just as good of a morale booster. Was given a foil wrap with around 0,15 inside "to get the day started" when I told my buddy I had work in the morning. I ended up melting it down on the foil and smoking 0,1 in the morning followed by 0,05 around noon. Now its 8pm and I feel physically back to baseline, still mentally high but able to eat and will probably sleep at like 1am. This type of use leaves me feeling satisfied and ready to rest, accomplished in my responsibilities which I've actually focused on and not blown off, without any type of comedown except maybe more tired tomorrow morning but none of the gnarly side effects, and most importantly physically healthy.
Don't get me wrong I would still IV 0,15 given the choice (my buddy gives me stuff as long as I promise not to shoot it because of how strung out he's seen me get in the past). But usually thats all that I need for a good 24-36 hours with IV. And I prefer it to smoking because it has a huge rush that levels out into a comparable smoked dose. But in terms of maintenence, productivity, as well as a hefty boost of morale and "scratching the itch" to get an instant fix without going bananas from dopamine overload, smoking is king.
Note: the dosages I am using are based on my tolerance as someone whose used regularly for ~15 months.