DONT SMOKE. Please, listen, I know some pals who got into 24/7 smoking. Worse than meth, worse psychosis,physical decay (food, mouth,...) which could also easily damage your heart. You know how fast an OD causes arrythmias, rac-amphetamine is much more benign. Tolerance will skyrocket, 1 g in a day, no problem. You won't care anyway until you see/hear things. I was sitting there, days in front of my computer, consuming drugs, doing nothing because the tweaking/paranoia was too bad even with benzos and gbl.
Insufflating is "ok", you _can_ maintain your daily routine and sleep with OTC sleeping pills, but hard to control. Still, it's very tempting, so you find yourself redosing in the evening till the next day, maybe ad infinitum? If you keep doses low (no euphoric rush please), the comedown will hardly be so bad that you crave it and give in and just go to bed.
By the way: Smoking pv has caused a toxic/allergic reaction a few times. (Was a chronicsmoker for weeks, result: dangerous hypokalemia, maybe the reason it didn't stimulatze me at all any more Edema in arms, hands, feet, maybe... lung edema? - headache, breathing problems, pain, fluids from lung or stomach. Plus, swallowing problems, you won't be able to swallow water or food, like everything is constricted and swelling is very dangerous in this area. Not painful, but something's broken for a few hours. Often, gbl was involved but even normal ibuprofen, even food I'm prone to react 'allergic' 'a bit' like milk or pizza.