“Of course I know how to roll a joint,” Martha Stewart proudly told an audience at the 92nd Street Y. If Martha rolls joints as perfect as her pie doughs, a pro-pot stance will be de rigueur soon enough. Until then, to de-stigmatize the drug, the Museum of Weed chronicles marijuana’s history in a 30,000-square-foot space. Topics range from the prison industrial complex to pop-culture portraits of pot smokers. —C.J.F.