What will happen if you have asthma and if you like to smoke weed?

Don't. Smoke from any source is an irritant to the lungs. In those with asthma, exposure to smoke has the potential to markedly worsen their asthma symptoms.
Make you wheeze. Burning anything causes the production of carbon monoxide and other gases and pollutants that can irritate the lung and in people with reactive airways cause wheezing. Smoking anything will not be beneficial to your asthma.