In that case, cocaine might not be able to give them the effect they want, but various amphetamines (i.e., amphetamines other than meth) could. It's not like meth delivers something that no other drug can deliver; it's just easy to make, and therefore cheap as hell, and therefore popular with people who can't afford anything that's less terrible for their bodies. So if those various other amphetamines were legally available, we'd probably see a decline in meth abuse, since meth's only selling point would be gone.
I don't think the spread of medical marijuana laws indicates that weed is "slowly becoming more legal", which was your original claim. Allowing medical use isn't a very meaningful step towards legalization. There are jurisdictions where heroin (diacetylmorphine) is legal to use in a medical capacity; do you think that means that heroin is closer to legalization?
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