What are the side effects of smoking weed and cigarettes but taking a break from weed and start to smoke cigarettes more ?

Respiratory/heart: Neither is good to use, so taking "a break" from both would have the side effect of better health. Smoking tobacco or weed creates the same dilemma for lung health -inhaling partially combusted botanical material laced with chemicals. Equally, cardiovascular health is compromised by using either. Infections occur more frequently in smokers too. So quit both & try not to rationalize their use.