Quote:
Originally Posted by MissSmallAimsSmall
"Very heavy use of marijuana is associated with persistent decrements in neurocognitive performance even after 28 days of abstinence." -Dose-related neurocognitive effects of marijuana use
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"Researchers have found that long-term consumption of low dose caffeine slowed hippocampus-dependent learning and impaired long-term memory in mice. Caffeine consumption for 4 weeks also significantly reduced hippocampal neurogenesis compared to controls during the experiment. The conclusion was that long-term consumption of caffeine could inhibit hippocampus-dependent learning and memory partially through inhibition of hippocampal neurogenesis."
Google.com
We can go back and forth all day by picking the most extreme circumstances and posting then as though they are the rule for every person that touches the substances.
Your points do nothing to quantify your argument.