A divorce may be granted for any of the following grounds:


(1) failure to consummate the marriage at the time of the marriage and continuing at the commencement of the action;


(2) adultery;


(3) conviction of a felony;


(4) wilful desertion for a period of one year;


(5) either


(A) cruel and inhuman treatment calculated to impair health or endanger life;


(B) personal indignities rendering life burdensome; or


(C) incompatibility of temperament;


(6) habitual gross drunkenness contracted since marriage and continuing for one year prior to the commencement of the action;


(7) [Repealed, Sec. 68 ch 127 SLA 1974].


(8) incurable mental illness when the spouse has been confined to an institution for a period of at least 18 months immediately preceding the commencement of the action; the status as to the support and maintenance of the mentally ill person is not altered in any way by the granting of the divorce;


(9) addiction of either party, subsequent to the marriage, to the habitual use of opium, morphine, cocaine, or a similar drug.