Bacterial infections have been known to cause horizontal ridges in nails. Yeast or other fungal infections can lead to nail issues and one of those symptoms can be horizontal ridges. Other infections like heart valve infections and viral warts can also change the way your nail looks, including horizontal ridges.
The clinical syndrome has been characterized by restlessness, anorexia, irritability and insomnia that begin less than 24 hours after discontinuation of marijuana, peak in intensity on days 2 to 4, and last for seven to 10 days (Budney et al., 1999; Haney et al., 1999; Mendelson et al., 1984).
Relatedly, marijuana withdrawal is real and is a diagnostic indicator of marijuana addiction. As with experiencing withdrawal from any addiction, there are physiological and psychological consequences that are unpleasant enough to encourage continued use for some users that are trying to quit.