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Early exposure may increase susceptibility to lifelong addiction

In high-level arsenic exposures, onset of neuropathy may occur after 7 to 14 days, with intense increased sweating in the distal lower extremities, muscle cramps, muscle tenderness, numbness, paresthesia, and spontaneous pain [Bleecker 2007]

And making tangible/putting into operation as much of that whole is humanly possible

What improves around Month 3: Cravings become less frequent Emotional balance increases Confidence and self-trust grow A stronger non-smoker identity forms While occasional urges may still occur, this phase often marks long-term success