There's loads of things to worry about if you are a bear such as valuations, China, US yield curve flattening, economic woes in Europe, the recent collapse in freight rates etc. Here is an apt summary of these views from the pro's:
Things to Worry About as a Bear
Cannabis Tech Firms Report Strong Marijuana Sales On 4/20 Weed Holiday
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Cannabis tech firms reported strong sales at dispensaries for the 420
marijuana holiday on April 20, the legal pot industry's biggest day of the
year.
35 minutes ago