Smoking Weed or Tobacco
Although there isn’t a concrete proof that smoking tobacco or weed cause, or worsen acne, the doubts qualify to make it worth mentioning. Smoking tobacco can cause acne and leave scars because of its impact on the collagen production. Whereas, marijuana, which is to some extent legal because of it positive therapeutic effects, can cause imbalance in production of testosterone, which leads to more production of sebum, and the cycle ensues.