Yea, there's an adjustment period of sorts. You might actually be fine and dandy, but the skewed sensory deprivation of a month long comedown after what's essentially a neurochemical overload of sorts, can do a number on one's habits and socializing. In a nutshell it's just a tremendous mind fuck, and while eating more amphetamine could get you back to square one in a good way, there's a point in time which this will no longer work how you want it and the side effects will be much worse so it's good to just nip it in the bud now even if it's uncomfortable. Funnily enough, the same can be said of benzos, alcohol etc... I think the only class of drugs which doesn't do this (ime) is opiates. But then again we all have our addictions so whether someone can be classified as an "alcoholic", as an addict, as a tweaker, junkie, pill head etc etc... Ppl use for different reasons, perhaps I might be especially bad because at one point or another I could say I was all of the above... literally a human garbage disposal. Health problems come sooner rather than later, and you might not notice 'em until months and months after you've quit due to the way (at least for me) our bodies tend to readjust over time... I started getting horrible back pain at one point and ongoing liver issues due to self medicating with amphetamine and alcohol (what started with responsible use eventually turned into something to get through the day). There's only so many days your body can go on 1 meal a day or snacks throughout the day, disturbed sleep rather than 2-3 meals with exercise before your body starts to stop functioning without the drug to keep it going. So in a way those secondary effects wear one down much much more than the neurotoxicity.