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autism is a broad term for a group of developmental disorders which likely has many different causes.... and poisoning is the most obvious. although no 'scientific' studies support this, empirical evidence does.
various poisons do cause symptoms very similar to a few forms of autism. these symptoms develop in young people, who, being small and weak, are obviously most vulnerable to toxins. poisons are also extremely prevalent in our modern environment.
we don't know what the cause is, but its not fair to discount environmental possibilities just because a scientist has not YET 'proven' it to you... the fact of the matter is that whatever the cause ends up being--genetic, drug related, etc..., it WILL be related to environmental factors and very likely poisons themselves...the rise of industrialism AND pharmaceuticals matches the trend of autism too closely!