As daily cannabis use rises to historic levels in the U.S., some longtime users are finding it harder to quit. Once celebrated as a safe alternative to alcohol or a tool for relaxation and healing, marijuana has quietly become a source of dependence for many — especially amid the spread of high-potency products. In Massachusetts, some people including regular users and former dispensary workers describe how routine use turned into addiction. Experts warn that the risks of heavy, daily use remain underrecognized as legalization and commercialization make cannabis more accessible than ever before.