18 seems far too much. A new city gets the same score increase as a new pop point. You can calculate it with a formula (which I don't remember) or you can use Civstats to get a rough number. You can identify new city plants from Civstats watching for a score increase that occurs while someone is logged in (rather than at the turn roll) and then simply subtract the new score from the score before the increase. This ignores rounding though, so a score increase on civstats of 3 could in fact be 3.3 or something.
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[SPOILER] retep can't get enough weed
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