In addition to Maryland’s sweeping gun-control measure, more than 300 other laws take effect Tuesday. Here’s a look at some of them:

Cellphone use while driving: Makes using a hand-held mobile device while driving an offense for which a motorist can be pulled over by police and cited. Under a 2010 ban, this was a secondary offense, meaning officers needed another reason to stop someone who was on the phone.

Seat-belt use: Requires all passengers, including those in the back seat, to wear seat belts.

Death penalty repeal: Replaces capital punishment with sentences of life without the possibility of parole. The measure does not apply to the five prisoners currently on death row.

Cyberbullying prohibition: Makes it a crime to harass a minor through the use of social media.

Medical marijuana: Allows qualified academic medical centers to distribute marijuana for medical purposes. A commission has been established to develop standards.

Designer drugs: Makes possession of designer drugs sometimes referred to as “K2/Spice” or “synthetic marijuana” a crime.

Defibrillators at pools: Requires public swimming pools to have defibrillators and staff trained to use them.

Shark fin possession: Prohibits possessing, selling or trading shark fins.

Campaign finance reform: Makes several changes in campaign finance law, including allowing legislative party caucus committees to raises money. Other provisions start in 2015.

Gambling at veterans organizations: Allows Montgomery County to join jurisdictions where instant lottery ticket machines are permitted at veterans halls.