History does not record that information. Weed has doubtlessly been known for thousands of years.
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Cannabis has been used by humans for thousands of years, with evidence of its use dating back to ancient times. The exact year of its discovery is not known, but its usage has been documented in various cultures spanning millennia.
Iodine was discovered when too much sulfuric acid was added to sea weed ash by Bernard Courtois in 1811.
Germanium was discovered in 1886 by German chemist Clemens Winkler.
The neutron was discovered in 1932 by English physicist James Chadwick.
Ammonia was discovered in 1774 by Swedish chemist Joseph Priestley.
Mica was discovered in 1847 by German chemist and mineralogist Johann Gottfried Gmelin.