Other reasons pot is illegal
1) It kills motivation and decreases ATP production over time
2) Decreased blood flow to prefrontal cortex inhibiting personality growth, judgment, reasoning, and goal-oriented decision making
3) Memory impairment
4) Impaired motor coordination
5) Sexual dysfunction over time
6) Decreased testosterone production
Is pot as harmful as most other drugs? No. But it's nothing to snicker about, either.
If everyone followed this logic almost everything would be banned.
Caffeine based products too. It is possible to overdose with caffeine but not with marijuana (and the latter is not even addictive).
Not to mention alcohol and tobacco
Reasons why pot is banned are politically and economically motivated and they are outlined a few posts above.
There is plenty of substances that are legal or less regulated which inflict more damage to human health than marijuana.